Hi. I recently started getting this error at tixati startup,
it actually keeps happening while it is running as well..

A pop-up shows:

Could not listen for incoming connections
Address: udp:0.0.0.0:30120
error: operation not permitted (1)

and it retries 30 seconds later by itself, I sometimes get the popup again.

Any ideas what to check?
Many thanks

PS: This is a fedora 24 machine running tixati 2.48

Here is what is logged at the home page:

listening on udp:0.0.0.0:30120 : Operation not permitted (1)
[06:38:08 PM]  listening on udp:0.0.0.0:30120
[06:38:10 PM]  socket closed while listening on udp:0.0.0.0:30120 : Operation not permitted (1)
[06:38:11 PM]  listening on udp:0.0.0.0:30120
[06:38:13 PM]  socket closed while listening on udp:0.0.0.0:30120 : Operation not permitted (1)
[06:38:14 PM]  listening on udp:0.0.0.0:30120
[06:38:15 PM]  socket closed while listening on udp:0.0.0.0:30120 : Operation not permitted (1)
[06:38:17 PM]  listening on udp:0.0.0.0:30120
[06:38:20 PM]  socket closed while listening on udp:0.0.0.0:30120 : Operation not permitted (1)
[06:38:23 PM]  listening on udp:0.0.0.0:30120
[06:38:29 PM]  socket closed while listening on udp:0.0.0.0:30120 : Operation not permitted (1)
[06:38:52 PM]  listening on udp:0.0.0.0:30120
[06:39:07 PM]  socket closed while listening on udp:0.0.0.0:30120 : Operation not permitted (1)
[06:39:30 PM]  listening on udp:0.0.0.0:30120
[06:39:47 PM]  socket closed while listening on udp:0.0.0.0:30120 : Operation not permitted (1)
[06:39:48 PM]  listening on udp:0.0.0.0:30120
[06:40:00 PM]  socket closed while listening on udp:0.0.0.0:30120 : Operation not permitted (1)
[06:40:29 PM]  listening on udp:0.0.0.0:30120
[06:40:53 PM]  socket closed while listening on udp:0.0.0.0:30120 : Operation not permitted (1)
[06:41:20 PM]  listening on udp:0.0.0.0:30120
[06:41:38 PM]  socket closed while listening on udp:0.0.0.0:30120 : Operation not permitted (1)
[06:41:38 PM]  listening on udp:0.0.0.0:30120
[06:41:39 PM]  socket closed while listening on udp:0.0.0.0:30120 : Operation not permitted (1)
[06:41:45 PM]  listening on udp:0.0.0.0:30120
[06:41:55 PM]  socket closed while listening on udp:0.0.0.0:30120 : Operation not permitted (1)
[06:41:57 PM]  listening on udp:0.0.0.0:30120

Operation not permitted sounds like a permissions issue with your .\tixati executable (OR it something with the binding IPv4 IPv6 settings... not sure if it normally bind to localhost)
But unfortunately I do not use linux. so i would search/look at any linux setup instructions here.

Many thanks for the feedback. I don't understand what happened; I have been using tixati for years with no ill effects. Maybe I have too many files queued (no seeders), I have about 30 such files waiting.. Maybe it sends out too many UDP datagrams at once, and Linux buffers overflow?

That is a possibility. Did this happen immediately after updating to 2.48 exe? With the same setup / settings can you get it to NOT ERROR on 2.47 ? That would be what I would do to verify bug status for the current stable version.
Then if not, and it still ERROR on 2.47 i would lessen/stop the transfers in queue. Queue doesn't really affect ports. DID you specify a specific ipv4 ipv6 bind IP/interface in your settings? For Windoes you have the option of the {} GUID, the named adapter "teredo tunnel interface" or the specific IP, which may or may not work (as posted elsewhere).
I tried ipv6 for instance and after a while ipv6 showed an error, meanwhile my ipv6 address list grows for my basic wifi adapter. So like i said maybe.

Are you relying on tixati's NAT_PMP mapping for your router to open the port? If you setup a rule on the device you can turn that off in the settings.
So check 1) version problem only 2.48 or earlier?
2) are you linking to a specific IPv4/ipv6 adapter IP, or are you using a proxy
3) is the routing rule setup by Tixati, or did you open the port on your firewall/router manually?

Please update anything you find out.

This worked for me (having the same problem)

Downgrade / use a kernel below 4.8.x (pick a 4.7.x one on fedora 24).

- my Nat-PMP/Upnp functions are off, i manually forward a port from my router to my ipaddress
- tried to bind Tixati to different interfaces, none solved the issue (empty field, local ipaddress or interface)
- i'm using no proxy or Socks
- please note that multiple ipaddresses are brigded on the same nic (because of VM's) and Tixati is running on the Hostsystem.
- running Fedora 25 + 4.8.8-300 kernel (which doesn't work)
- downgrading to v2.47 gives the same results

Keep up the good work

for more info check out my double post on this issue: https://forum.tixati.com/support/2989/

i am having the same problem on linux with 2.48 after update on linux. i just press ignore for now and things seem to be working correctly. im sure this is on the fix list for the next version.