Ugg. Did anyone test this???
Like with all our products, for a very long time, donrubin
Hi, That seemed to fix it.
1st rule of support, ty @basj.
Hi, That seemed to fix it. Question, I have Fing, and it is alerting me to some UPnP connections from my machine on two UDP ports. I was hoping Connection Explorer could help figure out what app is doing this. I have UPnP turned off in my router so I assume that these aren't valid connections. I have Tailscale could it be that? Thanks!
Yes, Tailscale is a very plausible source. It tries NAT-PMP, PCP, and UPnP-IGD to ask the router for a port mapping so
peers can connect directly — even if your router has UPnP disabled, Tailscale still sends the discovery packets (SSDP
on UDP 1900, NAT-PMP/PCP on UDP 5351). The router just ignores them.
A couple of things to check:
What ports is Fing flagging?
- UDP 1900 → SSDP/UPnP discovery (Tailscale, Windows Network Discovery, Plex, Spotify Connect, Chromecast apps all do
this)
- UDP 5351 / 5350 → NAT-PMP/PCP (Tailscale, some torrent clients)
- UDP 3702 → WS-Discovery (Windows itself)
To confirm it's Tailscale on Windows, open PowerShell as admin and run:
Get-NetUDPEndpoint | Where-Object { $_.LocalPort -in 1900,5350,5351 } | Select-Object LocalPort, OwningProcess
Get-Process -Id <PID>
That'll tell you exactly which process owns the socket. If it's tailscaled.exe, mystery solved.
You can also disable Tailscale's port-mapping attempts if you want the noise to stop — but they're harmless; with
router UPnP off they just go unanswered and Tailscale falls back to DERP relays or STUN.
Sean Drohan
Stardock Product Lifecycle Manager
