What Port 3705 Is
Port 3705 sits in the registered port range — the block from 1024 to 49151 that IANA maintains as a registry of claimed services. According to that registry, port 3705 belongs to Adobe Server 5, assigned over both TCP and UDP on January 14, 2008, by a Bernd Paradies at Adobe.1
That's almost everything anyone knows about it.
"Adobe Server 5" left nearly no public footprint. No product documentation. No deployment guides. No forum posts asking why it won't connect. It was registered, and then it apparently vanished — whether the product was cancelled, renamed, absorbed into something else, or simply never shipped is unclear. The IANA entry is the archaeological artifact.
The Registered Port Range
The 48,000-port registered range was designed as a middle ground: not as tightly controlled as the well-known ports below 1024, but not as free-for-all as the ephemeral ports above 49151. Any software project could apply to IANA for a registered port assignment, creating a loose global coordination system that let different applications avoid stepping on each other.
In practice, this system produced a lot of ghost registrations. Software projects claimed ports, products got cancelled or pivoted, and the registrations remained. Port 3705 is one of thousands of registered ports that are officially spoken for but rarely (or never) seen carrying traffic.
This matters because "registered" doesn't mean "active." Finding port 3705 open on a system doesn't mean Adobe Server 5 is running — it means something is listening there, and you should find out what.
If You See Port 3705 Open
Since this port has no real-world service claiming it, finding it open is worth investigating. Something is listening there, and it's not Adobe Server 5.
On Linux/macOS:
On Windows:
These commands will tell you which process holds the port and give you somewhere to start.
Frequently Asked Questions
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