Another odd issue I had recently was that my Synology Drive Connect on my Apple Macbook Air simply wouldn’t connect anymore. It just kept trying – no timeout, no “connection refused”, no error message at all. Meanwhile, Synology Drive Client on my Windows client worked fine. Both were up-to-date. At first I thought it might be a problem with the remote network I was connected to, but the issue persisted when I returned home. On my synology, the client was listed as “offline”.
Digging into this issue, it seems there was a problem with the logfiles. I am not exactly sure what the root cause was, but since the files are basically just text files, I assume they had grown too large and the client choked on them on startup.
Anyway, long story short. I stopped the drive client on my Macbook Air, then used the Terminal app to remove the log folder, located here:
/Users/{$username}/Library/Application Support/SynologyDrive/log
where, of course, {$username} was my login username on my Macbook Air. And lo and behold, upon restarting the client, it instantly connected. The client showed as “online” on my Synology DS, and files synced instantly.
I deleted the logs, but make sure to create a backup first if you think you might need them for anything.