Trust Relationship with primary DC broken

[Dorin]

We have a branch office which is connected to the main office over an IPSec tunnel between two pFSense. We have a single DC in the main office. Even I can join a computer from the branch office to the domain, after a while the error: "Trust Relationship Between This Workstation And The Primary Domain Failed" start appearing.

Computers from the branch office have the DC's IP as the primary DNS address. NSLookup also works well. I only noticed that if I run Test-computersecurechannel command, it returns False.

All traffic over the VPN is allowed. There are no errors in the firewall log.

I'm stuck. Any ideas?

Thank you.