Replication Agent fails with “An error occurred during decryption.”

While helping a customer on a Replication issue, we encountered an very unusual error message. An error occurred during decryption. There is no remote user 'distributor_admin' mapped to local user '(null)' from the remote server 'repl_distributor'. Changed database context to 'master'. (Microsoft SQL Server, Error: 15466) There are some key words in this error (‘distributor_admin’,
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