diff --git a/contrib/win32/win32compat/ssh-agent/agent-request.h b/contrib/win32/win32compat/ssh-agent/agent-request.h
index 9cec7de57c5f..7367ddade4cd 100644
--- a/contrib/win32/win32compat/ssh-agent/agent-request.h
+++ b/contrib/win32/win32compat/ssh-agent/agent-request.h
@@ -11,6 +11,7 @@ typedef unsigned __int64 u_int64_t;
 
 
 /* key management */
+int process_unsupported_request(struct sshbuf*, struct sshbuf*, struct agent_connection*);
 int process_add_identity(struct sshbuf*, struct sshbuf*, struct agent_connection*);
 int process_request_identities(struct sshbuf*, struct sshbuf*, struct agent_connection*);
 int process_sign_request(struct sshbuf*, struct sshbuf*, struct agent_connection*);
diff --git a/contrib/win32/win32compat/ssh-agent/connection.c b/contrib/win32/win32compat/ssh-agent/connection.c
index 199ab201aceb..ad6aa668cdeb 100644
--- a/contrib/win32/win32compat/ssh-agent/connection.c
+++ b/contrib/win32/win32compat/ssh-agent/connection.c
@@ -134,6 +134,13 @@ process_request(struct agent_connection* con)
 	debug("process agent request type %d", type);
 
 	switch (type) {
+	case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
+	case SSH_AGENTC_RSA_CHALLENGE:
+	case SSH_AGENTC_ADD_RSA_IDENTITY:
+	case SSH_AGENTC_REMOVE_RSA_IDENTITY:
+	case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
+		r = process_unsupported_request(request, response, con);
+		break;
 	case SSH2_AGENTC_ADD_IDENTITY:
 		r =  process_add_identity(request, response, con);
 		break;
@@ -175,4 +182,4 @@ process_request(struct agent_connection* con)
 	return r;
 }
 
-#pragma warning(pop)
\ No newline at end of file
+#pragma warning(pop)
diff --git a/contrib/win32/win32compat/ssh-agent/keyagent-request.c b/contrib/win32/win32compat/ssh-agent/keyagent-request.c
index 9714bcfbc7ad..8f27e0a48e43 100644
--- a/contrib/win32/win32compat/ssh-agent/keyagent-request.c
+++ b/contrib/win32/win32compat/ssh-agent/keyagent-request.c
@@ -115,6 +115,16 @@ convert_blob(struct agent_connection* con, const char *blob, DWORD blen, char **
 
 #define REG_KEY_SDDL L"D:P(A;; GA;;; SY)(A;; GA;;; BA)"
 
+int
+process_unsupported_request(struct sshbuf* request, struct sshbuf* response, struct agent_connection* con)
+{
+	int r = 0;
+	debug("ssh protocol 1 is not supported");
+	if (sshbuf_put_u8(response, SSH_AGENT_FAILURE) != 0)
+		r = -1;
+	return r;
+}
+
 int
 process_add_identity(struct sshbuf* request, struct sshbuf* response, struct agent_connection* con) 
 {