"unreachable - admin prohibited" message in SNMP/tcpdump
Just a small, helpful tidbit:
If you ever see the following in your tcpdump while resolving SNMP issues (when isn't SNMP having issues?):
ICMP host HOSTNAME unreachable - admin prohibited, length 76
It basically means that your iptables is blocking SNMP. This one has bit me on multiple occasions on boxes …
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