What This Port Does
Port 2066 is assigned to AURA — AVM USB Remote Architecture — the protocol powering the FRITZ!Box USB Remote Connection feature. It runs on both TCP and UDP.
The idea is disarmingly simple: you have a USB printer, scanner, or storage device plugged into your FRITZ!Box router. AURA lets computers on your network connect to that device as if the USB cable ran directly to them. Not a network share — a virtual USB connection. Device drivers, vendor utilities, scanner software, firmware updaters — they all work, because as far as the operating system is concerned, the device is local.
This is genuinely useful for the hardware that refuses to cooperate over normal network sharing. Many printers expose full functionality (scanning, ink level monitoring, firmware updates) only when connected via USB. AURA makes "via USB" a useful fiction your computer happily accepts.
Who Made It and Why
AVM is a German networking company best known for its FRITZ!Box line of home routers — dominant in German-speaking markets and widely used across Europe. They registered port 2066 with IANA in March 2006 under the service name aura.
The problem they were solving: USB was designed for physical proximity. Ethernet and Wi-Fi were designed for distance. These two worlds rarely talked to each other cleanly. AVM built the bridge.
Checking This Port on Your Network
If you see port 2066 active on your network, it's almost certainly FRITZ!Box hardware running the USB Remote Connection service. To verify:
On Linux/macOS:
On Windows:
With nmap (from another machine):
If you're not using a FRITZ!Box and you see this port open, investigate. Unrecognized open ports are worth understanding.
Firewall Notes
AVM's own documentation recommends allowing both TCP and UDP on port 2066 between the FRITZ!Box and any computer running the USB Remote Connection software. If the feature isn't working, a firewall blocking this port is the most common culprit.1
If you're not using this feature, there's no reason to have port 2066 open.
The Registered Port Range
Port 2066 sits in the registered ports range (1024–49151). This range is managed by IANA — organizations can apply to claim a port number for their service, providing a record that prevents collisions and gives network administrators something to look up when they see unexpected traffic.
Registration isn't enforcement. Nothing stops software from using any port it likes. But the registry means that when a firewall log shows traffic on 2066, there's an answer to "what's supposed to run here?" — even if what's actually running is something else entirely.
Frequently Asked Questions
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