Summary

When adding/saving a Bitbucket Server linked repository in Bamboo, the following error message shows up:

Environment

Bamboo 7, 8, 9.

Diagnosis

Looking at the logs, the following errors can be seen:

INFO [https-jsse-nio-8443-exec-18] [BitbucketServerServerConfigurator] Public key was added to Bitbucket Server (Bamboo user: admin, application: Bitbucket [https://git.repository], location: repository BP/bamboo-build-specs): ssh-ed25519 AHSJJRBBNSJSHDI1NTE5AAAGDHSIIQTOX/Ikendfganth0936+Ajdjdqpitsb https://repository.example
WARN [https-jsse-nio-8443-exec-18] [CacheAwareness$1] Inheriting disabledCaches:[com.atlassian.bamboo.ANY]
WARN [sshd-SshClient[7344e4e5]-nio2-thread-4] [LoggingUtils] exceptionCaught(ClientSessionImpl[git@git.repository/145.199.133.181:7999])[state=Opened] SshException: Server key did not validate
INFO [https-jsse-nio-8443-exec-18] [BitbucketServerServerConfigurator] Can't authenticate with Bitbucket Server despite successful public key storage: ssh-ed25519 AHSJJRBBNSJSHDI1NTE5AAAGDHSIIQTOX/Ikendfganth0936+Ajdjdqpitsb https://repository.example

Cause

The root cause can be one of the following:

• If the Managing Trusted key is enabled in Bamboo;
• If the user that created the Linked repository is deactivated;
• When the access key is missing in the Bitbucket repository;
• When Bitbucket is offline;
• When the Application link is not properly configured;
• When the repository has been removed or its name has been changed;
• If a capability is not listed in Bamboo.

Solution

Please check the following solutions:

• Check Manage trusted keys
  • Option 1: Disable the option 'Manage Trusted key' on  Bamboo Administration > Security > Security settings > Global security and permission properties, if not in use.
  • Option 2: Add the Repository SSH Host key to the Trusted keys. E.g:
    
    

    • Capture Bitbucket's SSH host public key:

      $ ssh-keyscan -p7999 bitbucket 2>/dev/null [bitbucket]:7999 ssh-rsa AHSJJRBBNSJSHDI1NTE5AAAGDHSIIQTOX......kendfgant

    • Add it to the Trusted Keys: Bamboo Administration > Trusted keys > Add keys where:
      • Host=<hostname>:<port> => bitbucket:7999
      • SSH key=<key type> <ssh host key> => ssh-rsa AHSJJRBBNSJSHDI1NTE...
        
        
• Save the repository:
  • Make sure you are an admin user in Bitbucket because when a non-admin user saves the Linked repository and for whatever reason is deactivated, the Linked repositories will fail due to connections being based on that user's credentials.
  • Go to the Bamboo Linked repository, save the repository to a different project/repository and save it back to the original one.
    
    
• Check Bamboo capabilities 
  • The issue can happen when a Git capability is not set on Bamboo and it impacts directly on the agents and builds execution. Please access Bamboo Administration > Overview > Server Capabilities and press 'Detect Server Capabilities'. This will force Bamboo to load all capabilities available.