Looking at the DirSync console I found many stopped-extension-dll
errors. I also found corresponding errors in the event log.
A quick search online suggested that this is most often
caused by the service account password expiring. I was sure this was not the case as I went
through this previously during the initial setup and mailbox migrations. I
was also able to log into the server using RDP with the service
account. I checked it anyway. The
password was already set to never expire.
I found the C drive was full. After checking in with the system admin that manages our monitoring to see why I did not receive a disk space alert, I started digging to see what was eating all of my drive space. I found that the DirSync tracing logs were the culprit. I don't think I'd ever need more than 14 days of logs. I setup a scheduled task to delete them, leaving 14 days worth using forfiles.exe
