SNMP traps sent to the SpectroSERVER running on Linux not being processed as expected. When a tcpdump is run on the SpectroSERVER system, the following message is seen when the trap is received:
13:46:36.878728 IP <IP Address> > <IP Address>: ICMP host <IP Address> unreachable - admin prohibited, length 157
Release : Any version of Spectrum installed on Linux
Component : Spectrum Core / SpectroSERVER
The "admin prohibited filter" seen in the tcpdump output means there is a firewall blocking a connection. It does it by sending back an ICMP packet meaning precisely that: the admin of that firewall doesn't want those packets to get through. It could be a firewall at the destination site. It could be a firewall in between. It could be iptables on the Linux system.
Check for a firewall that may be blocking the packets.
Check for iptables on the SpectroSERVER system by entering the following command as the root user:
If there are iptables, as a test, run the following command as the root user to flush the iptables and see if the trap packets are now processed:
If iptables are required in your environment, ensure they do not block the traps.