Errors with WireGuard site to site connection
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I'm new to pfSense (but not new to WireGuard). I've managed to setup a WireGuard site to site VPN with pfSense at my end (WireGuard on Ubuntu at my parent's) so that I can backup my data to their house.
The VPN kind of works. I can connect back to home from my phone, laptop etc. and my Synology at home shows that it's connected to the Synology at my parents'. The problem is that the backups from home often fail to backup to my parents (but not always, it sometimes works and sometimes doesn't).
The error messages on my Synology say something like 'Failed to transfer data due to inappropriate MT', 'Failed to connect to destination' (even though it always shows as connected when I check it). Looking at interfaces in pfSense it shows 178778 errors in, and 70678 errors out.
After looking at some tutorials I've tried setting the MTU and MSS in Interfaces > tun_wg0 to 1420 (tried individually on their own, and both together), but didn't seem to help.
Where would be the best place to look in pfSense to start troubleshooting this?