What MAC algorithms does Bitbucket support?
Platform Notice: Cloud Only - This article only applies to Atlassian products on the cloud platform.
Summary
Fetching the Bitbucket Cloud fingerprint fails due to a restriction of the MACs algorithm on the server.
A message authentication code (MAC), is a short piece of information used for authenticating a message.
Diagnosis
The issue is caused by a restriction on the MAC algorithm on the server. Restriction to accept only specific MAC algorithms leads to failure in fetching the Bitbucket Cloud fingerprint.
Cause
Bitbucket Cloud supports HMAC-SHA2-256 MAC algorithm. The root cause of the issue is the restriction on the MAC algorithm used on the customer server and not allowing HMAC-SHA2-256 MAC algorithm.
Solution
Allow HMAC-SHA2-256 as a supported algorithm.
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