What This Port Is
Port 10062 is registered with IANA for RightFax DocTransport—the module that handles incoming fax schedule requests from RightFax server components and manages Least-Cost Routing (LCR) decisions between RightFax Enterprise Servers.1
The Port Range
Port 10062 sits in the registered port range (1024-49151). This range exists because the well-known ports (0-1023) filled up. When TCP/IP exploded in the 1980s and 90s, vendors needed somewhere to put their new services. IANA said: you can use these ports if you register your service with us. Port 10062 is registered. It has a purpose. It belongs to OpenText's RightFax.
The Unsexy Truth
Fax machines should be dead. In most of the world, they are. But in enterprise environments—healthcare, finance, government, legal—fax is still the standard. It's the most auditable, legally defensible transmission method available. So RightFax still runs. Port 10062 still carries fax scheduling instructions between servers that businesses refuse to retire because the regulatory burden of doing so exceeds the cost of keeping them alive.
If You See Port 10062
You're probably on a Windows server running RightFax 9.x or 10.0. If this port is blocked or unavailable, RightFax loses functionality. Communication fails between modules. The fax queue breaks. So it stays open, often firewalled to specific internal IPs only.
How to Check What's Listening
To see if something's listening on port 10062:
On Windows:
On Linux/macOS:
Both will show the process ID if anything is bound to the port. If RightFax is running and working, RFDOCTRANS.exe will be listening.
Why Registered Ports Matter
Unassigned ports (in the registered range with no IANA entry) are genuinely free. You can use them for internal services, ephemeral connections, testing. Port 10062 is not free—it belongs to something specific. Respect that boundary. It keeps the Internet from becoming a war of port numbers, where everyone picks the same port and nothing talks to anything else.
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