I like to switch off IM/P2P but an external network scan claims some ports left opened. I uses an active/active cluster with Snort on and "anti-port" scanning on . The scan was performed with IM/P2P all settings switched off and also an "any" skiplist with the same results:
Starting Nmap 4.76 ( Nmap - Free Security Scanner For Network Exploration & Security Audits. ) at 2009-01-07 01:23 Westeuropäische Normalzeit
Initiating Parallel DNS resolution of 1 host. at 01:23
Completed Parallel DNS resolution of 1 host. at 01:23, 0.05s elapsed
Initiating SYN Stealth Scan at 01:23
Scanning 82.98.***.***[1000 ports]
SYN Stealth Scan Timing: About 15.00% done; ETC: 01:27 (0:02:54 remaining)
Discovered open port 1863/tcp on 82.98.***.***
Discovered open port 5190/tcp on 82.98.***.***
Completed SYN Stealth Scan at 01:24, 46.69s elapsed (1000 total ports)
Host 82.98.***.*** appears to be up ... good.
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