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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Troubleshooting Error: The merge process was unable to perform data validation on article

Sateesh Yele | Microsoft SQL Server Support I would like to share information about an interesting Replication issue I recently worked. Customer was getting unusual error messages during synchronization. Symptom: Merge agent is failing with the following error message when validating large tables with checksum. The merge process was unable to perform data validation on
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Snapshot Agent Performance –MaxBCPThreads

We noticed a large published database was taking a long time for the Snapshot to be applied to the subscriber.  Looking further in sp_who and sys.sysprocesses we noticed only one Distribution Agent thread executing the bulk insert statements. It took a while but we discovered the publication was created using “concurrent snapshot” option. -MaxBcpThreads number_of_threads
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