Port 1445 sits in the registered ports range (1024-49151), officially assigned by IANA to Proxima License Manager (proxima-lm), software license management system that most people have never encountered.1
But the official assignment is only part of the story.
The Official Assignment
According to IANA, port 1445 is designated for:
- Service name: proxima-lm
- Protocol: TCP
- Purpose: Proxima License Manager communications
This is legitimate software for managing software licenses, communicating between license servers and client applications to verify authorization.
The Complicated Reality
Port 1445's actual usage is messier than its official designation suggests:
Historical malware activity — Security databases flag port 1445 as having been used by trojans and backdoors to communicate with command-and-control servers.2 While this doesn't mean every connection on port 1445 is malicious, it means the port has been exploited in the past.
VPN usage — Some sources report port 1445 being used by SSTP (Secure Socket Tunneling Protocol), Microsoft's VPN protocol, though SSTP's official port assignment is 443.3 This may represent non-standard configurations.
License management — The actual Proxima License Manager service, though less commonly encountered than the other uses.
What This Means
Port 1445 demonstrates an important reality about the registered ports range: official assignments don't always reflect actual usage. Some ports are used exactly as IANA designated. Others accumulate alternative uses—some legitimate, some not.
Security Considerations
Because port 1445 has historical associations with malware:
- Unexpected traffic on this port warrants investigation
- Inbound connections should be blocked unless you're specifically running Proxima License Manager
- Outbound connections from unknown processes could indicate compromise
If you're not running license management software, you probably shouldn't see traffic on port 1445.
Checking What's Listening
To see if anything is using port 1445 on your system:
Windows:
Linux/Mac:
If you find something listening and don't recognize the process, investigate further.
The Registered Ports Range
Port 1445 belongs to the registered ports range (1024-49151). This range is:
- Assigned by IANA to specific services upon request
- Not reserved like well-known ports (0-1023)
- Less strictly enforced — applications can technically use these ports for other purposes
- More numerous — with over 48,000 possible ports, many registered ports are rarely used for their official purpose
Why Unassigned and Rarely-Used Ports Matter
The port system requires empty space. The 65,535 available ports need breathing room:
- Dynamic allocation — Applications need ports for temporary connections
- Custom services — Organizations run internal services that need port numbers
- Future assignments — New protocols need available port numbers
Not every port needs to be famous. Port 1445's obscurity is normal. What's unusual is its complicated history—officially assigned but also appropriated by malware and alternative uses.
What to Remember
Port 1445 is officially Proxima License Manager's port. In practice, it's a registered port that's been used for multiple purposes, not all of them legitimate.
If you see traffic on port 1445, don't assume it's malicious—but don't assume it's benign either. Investigate what's actually using it.
Frequently Asked Questions About Port 1445
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