Algorithm negotiation fail connecting to Ubuntu 20.04 server #37
Comments
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Also getting this. The server I am connecting to recently updated SFTP to a version that removes vulnerable key exchange algorithms: Any chance you just need to update the implementation of SFTP you use? |
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Update: I think the issue is not having an updated copy of OpenSSL ( > 1.1.1) and my server removing 1.1.1 support. |
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Same. Server running OpenSSL 1.1.1n from 15th of March 2022. 2022-05-12 22:09:25.532 - INFO - [HostServiceImpl] - Attempting to test connection to host |
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+1 {"level":"debug","time":"2022-08-30T22:52:17.232","sender":"sftpd","message":"failed to accept an incoming connection: ssh: no common algorithm for key exchange; client offered: [diffie-hellman-group1-sha1 diffie-hellman-group14-sha1 diffie-hellman-group-exchange-sha1], server offered: [curve25519-sha256 curve25519-sha256@libssh.org ecdh-sha2-nistp256 ecdh-sha2-nistp384 ecdh-sha2-nistp521 diffie-hellman-group14-sha256 ext-info-s]"} |
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Is there any fix out now? |
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Since this has been a problem for nearly 3 years and that's about the same length of time since there was an update to this codebase, I'm guessing this isn't going to be fixed and the project will slowly die as software gets updated and it stops working. |
When I attempt to connect to my server via sftp by adding it as a host, it comes back with the following error:
There was an error: Algorithm negotiation fail. My address for connection is 192.168.1.161 and port 22. I can connect using Filezilla to the server with no issues using the SFTP method and credentials. Below is the log capture if this helps any.
2021-06-09 22:12:35.474 - INFO - [LoggingManager] - Logging level now set at DEBUG 2021-06-09 22:12:42.263 - DEBUG - [SettingsServiceImpl] - Calling out to GitHub to check for new version (https://raw.githubusercontent.com/linuxserver/davos/LatestRelease/version.txt) 2021-06-09 22:12:42.291 - DEBUG - [SettingsServiceImpl] - GitHub responded with a 200, and body of 2.2.1 2021-06-09 22:12:42.291 - DEBUG - [VersionChecker] - Current version: 2.2.1, Remote version: 2.2.1 2021-06-09 22:12:42.291 - DEBUG - [VersionChecker] - Remote version is not newer 2021-06-09 22:12:58.323 - INFO - [HostServiceImpl] - Attempting to test connection to host 2021-06-09 22:12:58.324 - DEBUG - [HostServiceImpl] - Credentials: MYUSERNAME : MYPASSWORD 2021-06-09 22:12:58.324 - DEBUG - [HostServiceImpl] - Making connection on port 22 2021-06-09 22:12:58.324 - DEBUG - [SFTPClient] - Configuring connection credentials and options on session 2021-06-09 22:12:58.324 - DEBUG - [SFTPClient] - Username: 2021-06-09 22:12:58.356 - ERROR - [APIController] - Failed to connect to host 2021-06-09 22:12:58.356 - DEBUG - [APIController] - Exception: io.linuxserver.davos.transfer.ftp.exception.ClientConnectionException: Unable to connect to host 192.168.1.161 on port 22 at io.linuxserver.davos.transfer.ftp.client.SFTPClient.connect(SFTPClient.java:45) ~[classes!/:?] at io.linuxserver.davos.delegation.services.HostServiceImpl.testConnection(HostServiceImpl.java:98) ~[classes!/:?] at io.linuxserver.davos.web.controller.APIController.testConnection(APIController.java:193) [classes!/:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_275] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_275] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_275] at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_275] at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:220) [spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE] at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:134) [spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:116) [spring-webmvc-4.3.4.RELEASE.jar!/:4.3.4.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) [spring-webmvc-4.3.4.RELEASE.jar!/:4.3.4.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) [spring-webmvc-4.3.4.RELEASE.jar!/:4.3.4.RELEASE] at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) [spring-webmvc-4.3.4.RELEASE.jar!/:4.3.4.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963) [spring-webmvc-4.3.4.RELEASE.jar!/:4.3.4.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897) [spring-webmvc-4.3.4.RELEASE.jar!/:4.3.4.RELEASE] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) [spring-webmvc-4.3.4.RELEASE.jar!/:4.3.4.RELEASE] at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872) [spring-webmvc-4.3.4.RELEASE.jar!/:4.3.4.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:648) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) [spring-webmvc-4.3.4.RELEASE.jar!/:4.3.4.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-embed-websocket-8.5.6.jar!/:8.5.6] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) [spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:89) [spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) [spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) [spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:108) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:784) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:802) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1410) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_275] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_275] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.6.jar!/:8.5.6] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_275] Caused by: com.jcraft.jsch.JSchException: Algorithm negotiation fail at com.jcraft.jsch.Session.receive_kexinit(Session.java:582) ~[jsch-0.1.50.jar!/:?] at com.jcraft.jsch.Session.connect(Session.java:320) ~[jsch-0.1.50.jar!/:?] at com.jcraft.jsch.Session.connect(Session.java:183) ~[jsch-0.1.50.jar!/:?] at io.linuxserver.davos.transfer.ftp.client.SFTPClient.configureSessionAndConnect(SFTPClient.java:86) ~[classes!/:?] at io.linuxserver.davos.transfer.ftp.client.SFTPClient.connect(SFTPClient.java:41) ~[classes!/:?] ... 56 moreThe text was updated successfully, but these errors were encountered: