We have 2 DCs in our environment. The primary server (win 2012) and secondary server (win 2003), the primary server doesn't see the secondary server.
The secondary domain controller can ping the primary server but the primary server can't ping the secondary server. I can't transfer any files either, the firewall is turned off on both DC's, the only thing which changed is that i've installed a new anti-virus on the primary DC but even after that I was able to RDP and do everything with the secondary DC
any thoughts where else i should start looking