Router Not Always Able to Access LAN

[jt-socal]

I found this as my router's git backup keeps failing.  It has been happening since 27.7 and same problem exists in 27.7.8.  (Note: could be me)

My router is mostly unable to connect via TCP to my LANs.  In other words, the GIT backup works sometimes, but mostly not.

To confirm it is not some firewall rule, I created a first firewall rule in my floating rules to allow any direction on any interface the network on a relevant LAN.  I enabled logging and the rule is hit, but cannot access the LAN.  I confirmed same problem on another LAN (a vLAN) and same problem.  I am able to connect from one lan to the other no problem.  I am able to PING from the router to the same LAN ip no problem.

Suggestions please. 

[jt-socal]

Any help or suggestions for your troubled friend here?   :-[ :'(

[danderson]

TCP issues that I've had / seen in the past from lan over vpn where udp was fine was due to fragmentation.

Check mtu on both interfaces and or try mss settings. That solved my issues when tcp had issues but udp was fine. Maybe not as I was only having issues over IPsec links. I've not had the same tcp issues described from router to any of the vlans behind it. It