Port 20015 sits in the registered port range (1024-49151), where companies can request assignments from IANA for their specific applications. This is the middle zone: not fundamental enough to be well-known, but official enough to avoid the chaos of dynamic ports.
This port was used by FileWave, a device and software management platform for enterprise IT environments.
What FileWave Does
FileWave is software that lets IT departments manage computers, tablets, and phones across an organization. Push software updates. Enforce security policies. Monitor devices. The kind of infrastructure that keeps thousands of machines running in sync.
Port 20015 was the channel where FileWave clients talked to FileWave servers. Every managed device checking in, every software deployment, every configuration update.
The Redirect
Here's the strange part: port 20015 is deprecated, but you still configure it.1
When you set up a FileWave client, you enter port 20015. The system then automatically redirects to port 20017 for SSL-encrypted communication. You don't manually set 20017. You set 20015, and the software handles the upgrade behind the scenes.
This is technical debt as network protocol. The old port number exists purely as a configuration placeholder that immediately hands off to its successor. A ghost port. A redirect in the TCP layer.
Why Keep It?
Backwards compatibility. Organizations with thousands of managed devices can't update every configuration file simultaneously. So FileWave keeps accepting 20015, silently upgrading connections to encrypted 20017, and nobody's workflow breaks.
This is how legacy infrastructure works. The old port stays in the documentation. The configuration UIs still reference it. But under the hood, it's just pointing somewhere else.
The Registered Range
Port 20015 falls in the registered port range—ports 1024 through 49151. These are IANA-assigned ports for specific applications, but they're not considered "well-known" like HTTP on 80 or SSH on 22.
The registered range is where commercial software lives. Where enterprise applications stake their claim. Where protocols exist that millions of devices use, but most humans have never heard of.
Security Considerations
If you see port 20015 open on a system, it likely means FileWave device management software is running. The actual communication happens over port 20017 with SSL encryption, but 20015 might still be listening as an entry point.
For system administrators:
- Port 20015 should only be accessible within your internal network
- Ensure SSL is properly configured (the automatic redirect to 20017)
- FileWave handles remote device management, so this port has significant control over managed systems
For security auditors:
- Verify that port 20015 is not exposed to the public Internet
- Confirm that the redirect to SSL port 20017 is functioning
- Check that only authorized FileWave servers are listening on this port
How to Check What's Using Port 20015
On Linux/macOS:
On Windows:
If you find something listening here and it's not FileWave, investigate immediately. Unassigned and deprecated ports sometimes get repurposed by malware precisely because they're unexpected.
Why Unassigned Ports Matter
Most ports in the registered range are unassigned. They're available, waiting, part of the vast addressing space that makes the Internet possible.
These unassigned ports serve several purposes:
Room for growth - New protocols and applications need port numbers. The registered range provides space for legitimate services to claim official assignments.
Dynamic allocation - When your web browser makes an outbound connection, it uses a random high-numbered port as its source. These ephemeral ports come from the dynamic range (49152-65535), but the registered range can serve this purpose too.
Private use - Organizations run internal applications on unassigned ports without conflicting with public services. Your company's custom monitoring tool, internal API, or deployment system might use port 20015 (or any other unassigned port) without ever registering it with IANA.
The empty spaces in the port number system are not wasted. They're potential. They're flexibility. They're what allows the Internet to grow without a central authority micromanaging every socket.
Related Ports
- Port 20017: FileWave SSL client communication (the actual modern port)
- Port 20016: FileWave server-to-server communication
- Port 20030: FileWave Inventory Server
Frequently Asked Questions
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