I have about 130 NW5.1 and 6.5 servers with ZEN7 agents loaded.
I get alerts on all my local servers and some of the servers across WAN
links. All servers are set up the same.
Is there something that could be filtered out from the router level
preventing the ZEN SNMP traps from flowing??

We also have SolarWinds and that product see the server with SNMP.