After upgrading to 18.104.22.168 the following error is seen on the AS:
Error: Unhandled error in BinaryRequest: Invalid salt version
This prevents Backup Clients from doing backups.
This happens when a V5 Storage Platform containing group certificate(s) was upgraded to 22.214.171.124 (either directly or by doing a number of upgrades). When a backup client does a backup to one of the groups that has a V5 group certificate the error will show.
Run following sql script in AccountSeerver database to clear the old hash values:
update backupaccount set KeyHash = null where KeyHash not like '$2%';