What This Port Is
Port 2606 sits in the registered port range (1024–49151). These ports are assigned by IANA to specific services upon request, but unlike the well-known ports below 1024, nothing stops other software from using them without permission. The assignment is a reservation in a registry, not a lock on the door.
IANA lists port 2606 as assigned to Dell Netmon — described simply as a Dell network monitoring service — for both TCP and UDP.1 What Dell Netmon actually did, which product it shipped with, or whether it still exists in any current Dell offering is difficult to determine. The assignment is there. The service has nearly vanished from public documentation.
The More Notable History: EMC Documentum ApplicationXtender
The clearest reason port 2606 appears in security databases has nothing to do with Dell Netmon. EMC Documentum's ApplicationXtender Workflow software ran its Admin Agent service on TCP port 2606 — and in 2008, two serious vulnerabilities were disclosed:
CVE-2008-3685 — A directory traversal flaw in aws_tmxn.exe allowed remote attackers to upload arbitrary files and execute code by smuggling traversal sequences into requests on port 2606.2
CVE-2008-3684 — A heap-based buffer overflow in the same Admin Agent process enabled remote code execution. Same port, same service, same release window.3
Both affected ApplicationXtender Workflow 5.40 SP1 and possibly earlier versions. These were critical vulnerabilities — unauthenticated remote code execution on a listening admin agent. If you're running ancient EMC Documentum software and see traffic on port 2606, that's worth investigating.
What the Registered Range Means
Registered ports exist to reduce collisions. If two applications independently chose port 2606, they'd conflict on any machine running both. The registry lets developers stake a claim: "we use this, please route around us."
In practice, the system works imperfectly. Some registered ports belong to defunct software. Some well-known applications never registered and work fine anyway. Port 2606 illustrates the gap between paper assignments and operational reality: officially spoken for, practically empty.
What to Do If You See Port 2606 Open
If a scan or audit shows something listening on port 2606, find out what it is before assuming it's fine.
On Linux/macOS:
On Windows:
If you're running a modern Dell environment and nothing claims to be Dell Netmon, or you find old EMC Documentum software that hasn't been patched since 2008 — both warrant attention.
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