Checkmk Werk 15696: Linux agent: timing problem with 5 minute check interval

ID: 15696 Title: Linux agent: timing problem with 5 minute check interval Component: Checks & agents Level: 1 Class: Bug fix Version: 2.3.0b1 When setting the check interval of a Linux host to 5 minutes, you recently may have experienced sporadic connection resets. This results in a critical <i>Check_MK</i> service, showing a summary containing C+: [agent] Communication failed: [Errno 111] Connection refused C-: or similar. The reason for this was that the agent controller checks for an active connection registry every 5 minutes and by that closes the socket for an instant.<br> Since this 5-minute timeout starts whenever a connection has been accepted successfully, there's a significant chance to exacly hit a request from a 5-minute check interval. To fix this, the config reload is now done without closing the socket temporarily.<br> To apply this fix, you have to update agents once on affected hosts.<br> Since the agent communation only fails sporadically, this can be accomplished by an automatic agent update, if configured.