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After restart of Bamboo some of our agents went offline and some plans are failing with status "Reason for not building is unknown". What may be the possible cause of this problem and how can we fix it?
That's really hard to say without any data at hand, it could practically be anything not even knowing what build you are running there.
As a first step, you should open your failing build logs and check out what warnings and error messages you spot there. They typically provide a first indication on what to look at next.
If the log messages are meaningful, you can directly act on them. Say the error claims something like "file missing", you may want to verify first if that file really exists, and if so, you may be concerned about the file's name or permissions on it.
If an error message is very specific you might google for it and check out user forums or Community sites to find out more about that.
Besides by creating a Bamboo Support Zip, you'll find your main Bamboo configuration files in that ZIP archive as well as your Bamboo Server log (atlassian-bamboo.log) and your Bamboo Tomcat log (catalina.out).
Additionally, for remote agents, you find agents logs here:
Your elastic Bamboo agent logs you would receive per SCP, as described among a lot of further elastic agent information given, in the following KB.
You can grep any of these logs, depending on where you expect the error to occur and being logged out to and look for e.g. "fatal", "exception", "error".
As you see, there are many options to fish for an error. However, you may post a found error message to this thread and we might come up with further ideas for you.