Bamboo losing connection to Stash Git repositories

Question

I am experiencing intermittent loss of connection to git repositories from BAMBOO. the issue covers multiple repositories and seems random. The error I get is: WARN [sshd-SshClient[3b7fd39]-nio2-thread-5] [AcceptAllServerKeyVerifier] Server at :7999 presented unverified RSA key: c3:9f:d7:74:41:d0:c6:a7:f4:6e:c6:6e:fc:08:69:87 2014-11-18 03:01:14,921 WARN [Connection monitoring thread - 44e155f7-f4ea-4a43-ba11-9f0885a16a8c] [SshProxyCommand] While connecting to [:7999]: Authenticating remote session failed I can save the linked repositories after discovering the error. Next Builds seem fine. So the application links seem fine. The funny thing is there are no changes to trigger a build when these errors occur. These builds are not using polling but are set up with "stash repository changes trigger build". Does Bamboo check connections to git repositories even when there are no changes? What could be the possible causes of this? Why does Bamboo throw this error when the build is not scheduled to be ran? Any help would be appreciated!

Pawel Skierczynski · Accepted Answer

Stash is sending remote events to Bamboo notifying it about things. For many reasons this may not work - wrong version of Bamboo or Stash, wrong configuration, finally some network issues.

Bamboo is pinging Stash server to know if remote events are functional. If they are not it will fallback to polling. This polling interval is not configurable. It will connect to repository to check it for changes.

From what you said it is possible that there is some network problem, remote events stop working for awhile, Bamboo switches to polling and it fails because of network problem.

Actually polling from time to time just to ensure everything is in sync is not a bad idea anyway. Depending on your Bamboo version there is a system property "bamboo.stash.repository.trigger.polling.interval"  that you can set to number of seconds to enforce polling interval for Stash Trigger no matter what.