We have a one way external trust between two domains. The trust was configured and validated both ways everything worked fine. Randomly the trust will stop functioning. If we reboot one of the domain controllers the trust will be reestablished.
The domains are connected via MPLS circuit.
The trusting DC's DNS server has a secondary zone configured for the trusted domain, and vice versa with zone transfers enabled for DNS resolution.
Can someone assist with determining troubleshooting steps? Here are the relevant logs I have found from the trusting domain controller:
System- LsaSrv - 40961 - The Security System could not establish a secured connection with the server ldap/dc1.trusteddomain.local/trusteddomain.local@trusteddomain.LOCAL. No authentication protocol was available.
System - Netlogon - 5719 - The computer was not able to set up a secure session with a domain controller in domain TRUSTEDDOMAIN due to the following: There are no logon servers available to service the logon request.
Application - SceCli - 1202 - Security policies were propagated with warning 0x534. No mapping between account names and security IDs was done.
It seems to me that the trusting domain loses connection via the MPLS circuit to the trusted domain controller. However whenever we test this it is functioning. So maybe the trust is broken and is never restablished?
Any help is appreciated thanks!