I had the same issue after copying a known working server.conf file (with encrypted pass4symmkey) to new peer, and once i had it on the new peer I updated the password (so that it wasnt encrypted) and saved. BUT then i realized it was in "DOS" format, and I used vim command ":set ff=unix" and then saved. Switching from DOS to UNIX file format is what mangled it so that it could no longer be used. To resolve, i opened server.conf and removed the encrypted pass4symmkey and replace it with the unencrypted value and restarted.
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