Libcurl error 35 observed

Products

• Data Loss Prevention Endpoint Prevent

Issue/Introduction

8/18/2023 11:33:52 | 43120 | INFO    | AgentServices.ServerCommunicatorService.ConnectionStrategy | Libcurl Error: '35'. Error Message: SSL connect error. Last Error String: OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to <endpoint server>:10443 

Environment

Release : 15.8

Cause

This may happen due to the agent checking in while the user is logged out of their work station, such as background services running and the agent still being active. This may cause the agent to attempt to check into the endpoint server but fail due the lack of user context at an intermediary network device such as a DMZ proxy.

Example log excerpt that occurs when the user is logged off:
09/04/2023 14:05:29 |  6868 | INFO    | CoreServices.MessageLogger | MESSAGETYPE_SESSION_LOGOFF    MESSAGESOURCE_SERVICE_EXECUTABLE  09/04/2023 08:35:29  [Error: 2147491856]
09/04/2023 14:05:52 | 16928 | INFO    | AgentServices.ServerCommunicatorService.ConnectionStrategy | Libcurl Error: '35'. Error Message: SSL connect error. Last Error String: OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to <endpoint server>:10443 

Resolution

Ensure the agent is still connecting to the endpoint server when when a user logs on. 

If no issue occurs when users are logged in, this error can be safely ignored.