diff --git a/.gitignore b/.gitignore
index 8ff2b63..30b3aec 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,7 @@
 *.suo
 *.user
 *.sln.docstates
+.vscode
 
 # Build results
 [Dd]ebug/
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 500864b..656e4a0 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -32,5 +32,8 @@
         "typescriptreact",
         "yaml",
         "yml"
+    ],
+    "cSpell.enableFiletypes": [
+        "xml"
     ]
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ae3aa67..1097aaf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,18 @@
+## v0.15.0 [04/01/2020]
+
+### Release Notes
+Migrate to .net core 3.1. I have also moved the base .Net framework to 4.6 (long overdue). If there are anyone still using 4.5.1 I am sorry, its high time you upgrade. Bug & Performance fixes.
+
+### Bugfixes
+
+- [#90](https://github.com/AdysTech/InfluxDB.Client.Net/issues/90): PostPointsAsync method is so slow in linux os
+- [#91](https://github.com/AdysTech/InfluxDB.Client.Net/issues/91): StatusCode Forbidden not considered in GetAsync()
+- [#84](https://github.com/AdysTech/InfluxDB.Client.Net/issues/84): Execute Continuous Query every seconds 
+
 ## v0.11.0 [02/01/2020]
 
 ### Release Notes
-Option to add a rentention policy with infinite duration - Thanks to @jasase 
+Option to add a retention policy with infinite duration - Thanks to @jasase 
 Handle truncated responses due to "max-row-limit", (flag "partial=true"). Thanks to @tbraun-hk 
 
 ### Bugfixes
@@ -85,7 +96,7 @@ Fix escape sequence to match InfluxDB documentation
 
 ### Bugfixes
 
-- [#42](https://github.com/AdysTech/InfluxDB.Client.Net/issues/42): Stop chnaging column header case to Camel case
+- [#42](https://github.com/AdysTech/InfluxDB.Client.Net/issues/42): Stop changing column header case to Camel case
 - [#48](https://github.com/AdysTech/InfluxDB.Client.Net/issues/48): Incorrect escape sequence for string values with space
 - [#50](https://github.com/AdysTech/InfluxDB.Client.Net/issues/50): Missing quotes for retention policy name
 
@@ -107,7 +118,7 @@ Allow non ASCII passwords, escape double quotes (Thanks to [@siavelis](https://g
 ## v0.6.1 [6/03/2017]
 
 ### Release Notes
-Allow points to be passed without explictly setting time or precision. It also fixes an issue with previopus implementation of the chunking support.
+Allow points to be passed without explicitly setting time or precision. It also fixes an issue with previous implementation of the chunking support.
 
 
 ### Bugfixes
@@ -120,7 +131,7 @@ Allow points to be passed without explictly setting time or precision. It also f
 
 
 ### Breaking Change
-- Library will silently drop points older than retention period. This is similar to InfluDB behavios where it will reject those points with an `{"error":"partial write: points beyond retention policy dropped=225"}`
+- Library will silently drop points older than retention period. This is similar to InfluDB behavior where it will reject those points with an `{"error":"partial write: points beyond retention policy dropped=225"}`
 
 
 ## v0.6.1 [3/28/2017]
@@ -156,7 +167,7 @@ This version adds support for .Net Core.
 Minor release to fix a blocking bug with data series with microsecond precision.
 
 ### Breaking Change
-- `InfluxDBClient` now implements `IDispobale`, so plan to expect few warnings in your code. Similarly custom exceptions from this library are marked as `Serializable`
+- `InfluxDBClient` now implements `IDisposable`, so plan to expect few warnings in your code. Similarly custom exceptions from this library are marked as `Serializable`
 
 ### Bugfixes
 
@@ -168,12 +179,12 @@ Minor release to fix a blocking bug with data series with microsecond precision.
 ### Release Notes
 This version is a precursor to enable support for .Net Core.  This restructures the solution folders, makes the unit tests truly independent of each other. It also supports deleting Continuous Queries. As of now it still does not support the .NBet Core as there are few open issues (e.g. [#3199](https://github.com/dotnet/cli/issues/3199), [#147](https://github.com/aspnet/Tooling/issues/147)) which are rooted in .Net Core's dependency on `xproj` model. Once they move to `csproj` these issues will be resolved, and this library will support .Net Core as well via .Net Standard (1.6+) PCL. Final goal is to have same set of source files, which gets complied as normal .Net 4.5 class library, and a PCL for the Core.
 
-This version moves away from `JavaScriptSerializer` to [Json.NET](https://github.com/JamesNK/Newtonsoft.Json). Functionally this is a transparent chnage. But this is required as former is not supported in .Net Core.
+This version moves away from `JavaScriptSerializer` to [Json.NET](https://github.com/JamesNK/Newtonsoft.Json). Functionally this is a transparent change. But this is required as former is not supported in .Net Core.
 
 ### Features
 
 - [#16](https://github.com/AdysTech/InfluxDB.Client.Net/issues/16): Create / Delete Continuous Query
-- QueryMultiSeriesAsync returns the time in a `DateTime` object if the series has one. The method also supports different epoch precisoins in query results now.
+- QueryMultiSeriesAsync returns the time in a `DateTime` object if the series has one. The method also supports different epoch precisions in query results now.
 
 
 ### Breaking Change
diff --git a/appveyor.yml b/appveyor.yml
index bd99090..54a30ea 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,30 +1,36 @@
 version: 0.{build}
-image: Visual Studio 2017
+image: Visual Studio 2019
+
 pull_requests:
   do_not_increment_build_number: true
+
 branches:
   only:
   - master
+
 before_build:
 - nuget restore
 - dotnet restore
+
 build:
   verbosity: minimal
   publish_nuget: true
   publish_nuget_symbols: true
   use_snupkg_format: true
+
 before_test:
 - ps: tests\InfluxDB.Client.Net.TestSetup.ps1
-after_test:
-- ps: Get-ChildItem -include "AdysTech.InfluxDB.Client.Net.Core*nupkg" | % { Push-AppveyorArtifact $_.FullName -FileName $_.Name }
+
 deploy:
 - provider: NuGet
   api_key:
-    secure: nlBDuJJE7GoAtSvHKJDjdutExvlEQErL8Q9gFqmhURY4xUgFT946cs2mLeQ2Qezi
+    secure: x3I/stoKSfZBfSgc91uX34lkSU+Qs7XfgVJVSSKZsgeqKpz3WLIye9Ys6Gv7jpoo
   on:
     branch: master
+
+
 artifacts:
-  - path: 'src\**\*.nupkg'
+  - path: '*.nupkg'
     name: NuGet Packages
-  - path: 'src\**\*.snupkg'
+  - path: '*.snupkg'
     name: NuGet Symbol Packages
\ No newline at end of file
diff --git a/src/AdysTech.InfluxDB.Client.Net.Core/AdysTech.InfluxDB.Client.Net.Core.csproj b/src/AdysTech.InfluxDB.Client.Net.Core/AdysTech.InfluxDB.Client.Net.Core.csproj
index 8bf6de1..82ac4f6 100644
--- a/src/AdysTech.InfluxDB.Client.Net.Core/AdysTech.InfluxDB.Client.Net.Core.csproj
+++ b/src/AdysTech.InfluxDB.Client.Net.Core/AdysTech.InfluxDB.Client.Net.Core.csproj
@@ -1,14 +1,14 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFramework>netstandard2.1</TargetFramework>
     <Description>.Net client for InfluxDB. Supports all InfluxDB version from 0.9 onwards. Supports both .Net 4.6.1+ and .Net Core 2.0+.</Description>
     <Product>AdysTech.InfluxDB.Client.Net</Product>
     <Company>AdysTech</Company>
     <Authors>AdysTech;mvadu</Authors>
-    <Version>0.11.1.0</Version>
+    <Version>0.15.0.0</Version>
     <PackageId>AdysTech.InfluxDB.Client.Net.Core</PackageId>
-    <Copyright>© AdysTech 2016-2019</Copyright>
+    <Copyright>© AdysTech 2016-2020</Copyright>
     <PackageProjectUrl>https://github.com/AdysTech/InfluxDB.Client.Net</PackageProjectUrl>
     <RepositoryUrl>https://github.com/AdysTech/InfluxDB.Client.Net</RepositoryUrl>
     <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
@@ -17,11 +17,11 @@
     <PackageReleaseNotes>This is a feature rich .Net client for InfluxDB. All methods are exposed as Async methods, so that the calling thread will not be blocked. 
 It currently supports 
 
-1. Connecting using credentials 
-2. Querying all existing databases 
-3. Creating new database 
-4. Querying for the whole DB structure (hierarchical structure of all measurements, and fields) 
-5. Writing single, multiple values to db 
+1.  Connecting using credentials 
+2.  Querying all existing databases 
+3.  Creating new database 
+4.  Querying for the whole DB structure (hierarchical structure of all measurements, and fields) 
+5.  Writing single, multiple values to db 
 6.  Retention policy management 
 7.  Post data to specific retention policies 
 8.  Query for all Continuous Queries 
@@ -29,8 +29,8 @@ It currently supports
 10. Chunking Support in queries
 11. Drop databases, measurements or points
 12. Get series count or points count for a measurement</PackageReleaseNotes>
-    <AssemblyVersion>0.11.1.0</AssemblyVersion>
-    <FileVersion>0.11.1.0</FileVersion>
+    <AssemblyVersion>0.15.0.0</AssemblyVersion>
+    <FileVersion>0.15.0.0</FileVersion>
     <PackageTags>InfluxDB Influx TSDB TimeSeries InfluxData Chunking retention RetentionPolicy</PackageTags>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
   </PropertyGroup>
diff --git a/src/AdysTech.InfluxDB.Client.Net/AdysTech.InfluxDB.Client.Net.csproj b/src/AdysTech.InfluxDB.Client.Net/AdysTech.InfluxDB.Client.Net.csproj
index 6e28cbe..075b9da 100644
--- a/src/AdysTech.InfluxDB.Client.Net/AdysTech.InfluxDB.Client.Net.csproj
+++ b/src/AdysTech.InfluxDB.Client.Net/AdysTech.InfluxDB.Client.Net.csproj
@@ -9,7 +9,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>AdysTech.InfluxDB.Client.Net</RootNamespace>
     <AssemblyName>AdysTech.InfluxDB.Client.Net</AssemblyName>
-    <TargetFrameworkVersion>v4.5.1</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.6</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <TargetFrameworkProfile />
   </PropertyGroup>
@@ -31,9 +31,6 @@
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="Newtonsoft.Json, Version=10.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
-      <HintPath>..\..\packages\Newtonsoft.Json.10.0.3\lib\net45\Newtonsoft.Json.dll</HintPath>
-    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
     <Reference Include="System.Net.Http" />
@@ -117,7 +114,11 @@
   </ItemGroup>
   <ItemGroup>
     <None Include="AdysTech.InfluxDB.Client.Net.nuspec" />
-    <None Include="packages.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json">
+      <Version>12.0.3</Version>
+    </PackageReference>
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
diff --git a/src/AdysTech.InfluxDB.Client.Net/AdysTech.InfluxDB.Client.Net.nuspec b/src/AdysTech.InfluxDB.Client.Net/AdysTech.InfluxDB.Client.Net.nuspec
index d8a96ef..96dad2c 100644
--- a/src/AdysTech.InfluxDB.Client.Net/AdysTech.InfluxDB.Client.Net.nuspec
+++ b/src/AdysTech.InfluxDB.Client.Net/AdysTech.InfluxDB.Client.Net.nuspec
@@ -14,11 +14,11 @@
       This is a feature rich .Net client for InfluxDB. All methods are exposed as Async methods, so that the calling thread will not be blocked.
       It currently supports
 
-      1. Connecting using credentials
-      2. Querying all existing databases
-      3. Creating new database
-      4. Querying for the whole DB structure (hierarchical structure of all measurements, and fields)
-      5. Writing single, multiple values to db
+      1.  Connecting using credentials
+      2.  Querying all existing databases
+      3.  Creating new database
+      4.  Querying for the whole DB structure (hierarchical structure of all measurements, and fields)
+      5.  Writing single, multiple values to db
       6.  Retention policy management
       7.  Post data to specific retention policies
       8.  Query for all Continuous Queries
diff --git a/src/AdysTech.InfluxDB.Client.Net/Properties/AssemblyInfo.cs b/src/AdysTech.InfluxDB.Client.Net/Properties/AssemblyInfo.cs
index 3127ba0..9af327d 100644
--- a/src/AdysTech.InfluxDB.Client.Net/Properties/AssemblyInfo.cs
+++ b/src/AdysTech.InfluxDB.Client.Net/Properties/AssemblyInfo.cs
@@ -9,7 +9,7 @@
 [assembly: AssemblyConfiguration("")]
 [assembly: AssemblyCompany("AdysTech")]
 [assembly: AssemblyProduct("AdysTech.InfluxDB.Client.Net")]
-[assembly: AssemblyCopyright("Copyright © AdysTech 2016-2019")]
+[assembly: AssemblyCopyright("Copyright © AdysTech 2016-2020")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
 
@@ -31,5 +31,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("0.11.1.0")]
-[assembly: AssemblyFileVersion("0.11.1.0")]
+[assembly: AssemblyVersion("0.15.0.0")]
+[assembly: AssemblyFileVersion("0.15.0.0")]
diff --git a/src/AdysTech.InfluxDB.Client.Net/packages.config b/src/AdysTech.InfluxDB.Client.Net/packages.config
deleted file mode 100644
index b0cea6b..0000000
--- a/src/AdysTech.InfluxDB.Client.Net/packages.config
+++ /dev/null
@@ -1,4 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<packages>
-  <package id="Newtonsoft.Json" version="10.0.3" targetFramework="net451" />
-</packages>
\ No newline at end of file
diff --git a/src/DataStructures/InfluxContinuousQuery.cs b/src/DataStructures/InfluxContinuousQuery.cs
index f9d019f..64be80e 100644
--- a/src/DataStructures/InfluxContinuousQuery.cs
+++ b/src/DataStructures/InfluxContinuousQuery.cs
@@ -43,7 +43,7 @@ public class InfluxContinuousQuery : IInfluxContinuousQuery
         /// </summary>
         public bool HasResampleClause { get { return (ResampleDuration != TimeSpan.MinValue || ResampleFrequency != TimeSpan.MinValue); } }
 
-        public InfluxContinuousQuery ()
+        public InfluxContinuousQuery()
         {
             ResampleDuration = TimeSpan.MinValue;
             ResampleFrequency = TimeSpan.MinValue;
@@ -57,38 +57,43 @@ public InfluxContinuousQuery ()
 
         public bool Deleted { get; internal set; }
 
-        internal string GetCreateSyntax ()
+        internal string GetCreateSyntax()
         {
-            if (!String.IsNullOrWhiteSpace (DBName) && !String.IsNullOrWhiteSpace (Name) && !String.IsNullOrWhiteSpace (Query))
+            if (!String.IsNullOrWhiteSpace(DBName) && !String.IsNullOrWhiteSpace(Name) && !String.IsNullOrWhiteSpace(Query))
             {
                 if (ResampleDuration == TimeSpan.MinValue && ResampleFrequency == TimeSpan.MinValue)
                     return $"CREATE CONTINUOUS QUERY \"{Name}\" ON \"{DBName}\" BEGIN {Query} END";
                 else if (ResampleDuration != TimeSpan.MinValue && ResampleFrequency != TimeSpan.MinValue)
                     return $"CREATE CONTINUOUS QUERY \"{Name}\" ON \"{DBName}\" RESAMPLE EVERY {ResampleFrequency.TotalMinutes}m FOR {ResampleDuration.TotalMinutes}m BEGIN {Query} END";
                 else if (ResampleFrequency != TimeSpan.MinValue)
-                    return $"CREATE CONTINUOUS QUERY \"{Name}\" ON \"{DBName}\" RESAMPLE EVERY {ResampleFrequency.TotalMinutes}m BEGIN {Query} END";
+                {
+                    if (ResampleFrequency.TotalMinutes > 1)
+                        return $"CREATE CONTINUOUS QUERY \"{Name}\" ON \"{DBName}\" RESAMPLE EVERY {(int)ResampleFrequency.TotalMinutes}m BEGIN {Query} END";
+                    else
+                        return $"CREATE CONTINUOUS QUERY \"{Name}\" ON \"{DBName}\" RESAMPLE EVERY {(int)ResampleFrequency.TotalSeconds}s BEGIN {Query} END";
+                }
                 else if (ResampleDuration != TimeSpan.MinValue)
                     return $"CREATE CONTINUOUS QUERY \"{Name}\" ON \"{DBName}\" RESAMPLE FOR {ResampleDuration.TotalMinutes}m BEGIN {Query} END";
             }
-            else if (String.IsNullOrWhiteSpace (Query))
-                throw new ArgumentException ("Query part of CQ is not defined");
-            else if (String.IsNullOrWhiteSpace (Name))
-                throw new ArgumentException ("CQ Name not set");
-            else if (String.IsNullOrWhiteSpace (DBName))
-                throw new ArgumentException ("DBName for CQ is not set");
+            else if (String.IsNullOrWhiteSpace(Query))
+                throw new ArgumentException("Query part of CQ is not defined");
+            else if (String.IsNullOrWhiteSpace(Name))
+                throw new ArgumentException("CQ Name not set");
+            else if (String.IsNullOrWhiteSpace(DBName))
+                throw new ArgumentException("DBName for CQ is not set");
             return null;
         }
 
-        internal string GetDropSyntax ()
+        internal string GetDropSyntax()
         {
-            if (!String.IsNullOrWhiteSpace (DBName) && !String.IsNullOrWhiteSpace (Name))
+            if (!String.IsNullOrWhiteSpace(DBName) && !String.IsNullOrWhiteSpace(Name))
             {
                 return $"DROP CONTINUOUS QUERY \"{Name}\" ON \"{DBName}\"";
             }
-            else if (String.IsNullOrWhiteSpace (Name))
-                throw new ArgumentException ("CQ Name not set");
-            else if (String.IsNullOrWhiteSpace (DBName))
-                throw new ArgumentException ("DBName for CQ is not set");
+            else if (String.IsNullOrWhiteSpace(Name))
+                throw new ArgumentException("CQ Name not set");
+            else if (String.IsNullOrWhiteSpace(DBName))
+                throw new ArgumentException("DBName for CQ is not set");
             return null;
         }
     }
diff --git a/src/DataStructures/InfluxDBClient.cs b/src/DataStructures/InfluxDBClient.cs
index 6819f3a..b2824bf 100644
--- a/src/DataStructures/InfluxDBClient.cs
+++ b/src/DataStructures/InfluxDBClient.cs
@@ -105,8 +105,16 @@ private async Task<HttpResponseMessage> GetAsync(Dictionary<string, string> Quer
                 {
                     return response;
                 }
-                else if (response.StatusCode == HttpStatusCode.Unauthorized || response.StatusCode == HttpStatusCode.BadGateway || (response.StatusCode == HttpStatusCode.InternalServerError && response.ReasonPhrase == "INKApi Error")) //502 Connection refused
+                else if (response.StatusCode == HttpStatusCode.Unauthorized 
+                        || (response.StatusCode == HttpStatusCode.InternalServerError && response.ReasonPhrase == "INKApi Error")
+                        || response.StatusCode == HttpStatusCode.Forbidden 
+                        || response.StatusCode == HttpStatusCode.ProxyAuthenticationRequired
+                        || (int)response.StatusCode == 511) //511 NetworkAuthenticationRequired
                     throw new UnauthorizedAccessException("InfluxDB needs authentication. Check uname, pwd parameters");
+                else if(response.StatusCode == HttpStatusCode.BadGateway || response.StatusCode == HttpStatusCode.GatewayTimeout)
+                {
+                    throw new ServiceUnavailableException(await response.Content.ReadAsStringAsync());
+                }
                 else if (response.StatusCode == HttpStatusCode.BadRequest)
                 {
                     throw InfluxDBException.ProcessInfluxDBError(await response.Content.ReadAsStringAsync());
@@ -148,8 +156,20 @@ private async Task<HttpResponseMessage> PostAsync(Dictionary<string, string> End
                     zippedByteArrayContent.Headers.ContentEncoding.Add("gzip");
                     HttpResponseMessage response = await _client.PostAsync(builder.Uri, zippedByteArrayContent);
 
-                    if (response.StatusCode == HttpStatusCode.Unauthorized || response.StatusCode == HttpStatusCode.BadGateway || (response.StatusCode == HttpStatusCode.InternalServerError && response.ReasonPhrase == "INKApi Error")) //502 Connection refused
+                    if (response.StatusCode == HttpStatusCode.Unauthorized
+                       || (response.StatusCode == HttpStatusCode.InternalServerError && response.ReasonPhrase == "INKApi Error")
+                       || response.StatusCode == HttpStatusCode.Forbidden
+                       || response.StatusCode == HttpStatusCode.ProxyAuthenticationRequired
+                       || (int)response.StatusCode == 511) //511 NetworkAuthenticationRequired
                         throw new UnauthorizedAccessException("InfluxDB needs authentication. Check uname, pwd parameters");
+                    else if (response.StatusCode == HttpStatusCode.BadGateway || response.StatusCode == HttpStatusCode.GatewayTimeout)
+                    {
+                        throw new ServiceUnavailableException(await response.Content.ReadAsStringAsync());
+                    }
+                    else if (response.StatusCode == HttpStatusCode.BadRequest)
+                    {
+                        throw InfluxDBException.ProcessInfluxDBError(await response.Content.ReadAsStringAsync());
+                    }
 
                     return response;
                 }
@@ -188,8 +208,16 @@ private async Task<bool> PostPointsAsync(string dbName, TimePrecision precision,
             HttpResponseMessage response = await PostAsync(endPoint, Encoding.UTF8.GetBytes(line.ToString()));
             line.Clear();
 
-            if (response.StatusCode == HttpStatusCode.Unauthorized || response.StatusCode == HttpStatusCode.BadGateway || (response.StatusCode == HttpStatusCode.InternalServerError && response.ReasonPhrase == "INKApi Error")) //502 Connection refused
+            if (response.StatusCode == HttpStatusCode.Unauthorized
+                       || (response.StatusCode == HttpStatusCode.InternalServerError && response.ReasonPhrase == "INKApi Error")
+                       || response.StatusCode == HttpStatusCode.Forbidden
+                       || response.StatusCode == HttpStatusCode.ProxyAuthenticationRequired
+                       || (int)response.StatusCode == 511) //511 NetworkAuthenticationRequired
                 throw new UnauthorizedAccessException("InfluxDB needs authentication. Check uname, pwd parameters");
+            else if (response.StatusCode == HttpStatusCode.BadGateway || response.StatusCode == HttpStatusCode.GatewayTimeout)
+            {
+                throw new ServiceUnavailableException(await response.Content.ReadAsStringAsync());
+            }
             //if(response.StatusCode==HttpStatusCode.NotFound)
             else if (response.StatusCode == HttpStatusCode.BadRequest)
             {
@@ -487,8 +515,20 @@ public async Task<string> GetServerVersionAsync()
                 {
                     return response.Headers.GetValues("X-Influxdb-Version").FirstOrDefault();
                 }
-                else if (response.StatusCode == HttpStatusCode.Unauthorized || response.StatusCode == HttpStatusCode.BadGateway || (response.StatusCode == HttpStatusCode.InternalServerError && response.ReasonPhrase == "INKApi Error")) //502 Connection refused
+                if (response.StatusCode == HttpStatusCode.Unauthorized
+                       || (response.StatusCode == HttpStatusCode.InternalServerError && response.ReasonPhrase == "INKApi Error")
+                       || response.StatusCode == HttpStatusCode.Forbidden
+                       || response.StatusCode == HttpStatusCode.ProxyAuthenticationRequired
+                       || (int)response.StatusCode == 511) //511 NetworkAuthenticationRequired
                     throw new UnauthorizedAccessException("InfluxDB needs authentication. Check uname, pwd parameters");
+                else if (response.StatusCode == HttpStatusCode.BadGateway || response.StatusCode == HttpStatusCode.GatewayTimeout)
+                {
+                    throw new ServiceUnavailableException(await response.Content.ReadAsStringAsync());
+                }
+                else if (response.StatusCode == HttpStatusCode.BadRequest)
+                {
+                    throw InfluxDBException.ProcessInfluxDBError(await response.Content.ReadAsStringAsync());
+                }
             }
             catch (HttpRequestException e)
             {
diff --git a/src/DataStructures/InfluxDatapoint.cs b/src/DataStructures/InfluxDatapoint.cs
index c5e8f8d..1009e5f 100644
--- a/src/DataStructures/InfluxDatapoint.cs
+++ b/src/DataStructures/InfluxDatapoint.cs
@@ -179,7 +179,7 @@ public void ConvertToInfluxLineProtocol(StringBuilder line)
                 //double has to have a . as decimal seperator for Influx
                 Fields.ToList().ForEach(v =>
                 {
-                    line.AppendFormat("{0}={1},", v.Key.EscapeChars(comma: true, equalSign: true, space: true), String.Format(new CultureInfo("en-US"), "{0}", v.Value));
+                    line.AppendFormat("{0}={1},", v.Key.EscapeChars(comma: true, equalSign: true, space: true), String.Format(CultureInfo.GetCultureInfo("en-US"), "{0}", v.Value));
                 });
                 line.Remove(line.Length - 1, 1);
             }
diff --git a/src/DataStructures/InfluxValueField.cs b/src/DataStructures/InfluxValueField.cs
index 441473a..f88461f 100644
--- a/src/DataStructures/InfluxValueField.cs
+++ b/src/DataStructures/InfluxValueField.cs
@@ -37,12 +37,12 @@ public override string ToString()
             else if (Value is double dblValue)
             {
                 // double has to have a . as decimal seperator for Influx
-                return String.Format(new CultureInfo("en-US"), "{0}", dblValue);
+                return String.Format(CultureInfo.GetCultureInfo("en-US"), "{0}", dblValue);
             }
             else if (Value is float flValue)
             {
                 // double has to have a . as decimal seperator for Influx
-                return String.Format(new CultureInfo("en-US"), "{0}", flValue);
+                return String.Format(CultureInfo.GetCultureInfo("en-US"), "{0}", flValue);
             }
             else if (Value is DateTime dtValue)
             {
diff --git a/src/DataStructures/ServiceUnavailableException.cs b/src/DataStructures/ServiceUnavailableException.cs
index 56af2b4..ab57b3a 100644
--- a/src/DataStructures/ServiceUnavailableException.cs
+++ b/src/DataStructures/ServiceUnavailableException.cs
@@ -7,6 +7,10 @@ public class ServiceUnavailableException:InvalidOperationException
         public ServiceUnavailableException():base("InfluxDB service is not available")
         {
             
+        }
+        public ServiceUnavailableException(string Message) : base(Message)
+        {
+
         }
     }
 }
diff --git a/tests/AdysTech.InfluxDB.Client.Net.Core.Test/AdysTech.InfluxDB.Client.Net.Core.Test.csproj b/tests/AdysTech.InfluxDB.Client.Net.Core.Test/AdysTech.InfluxDB.Client.Net.Core.Test.csproj
index ab63c9c..fb85a4a 100644
--- a/tests/AdysTech.InfluxDB.Client.Net.Core.Test/AdysTech.InfluxDB.Client.Net.Core.Test.csproj
+++ b/tests/AdysTech.InfluxDB.Client.Net.Core.Test/AdysTech.InfluxDB.Client.Net.Core.Test.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>    
-    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>