# Candidate doesn't pairing Windows10
**URL:** https://mediasoup.discourse.group/t/candidate-doesnt-pairing-windows10/1385
**Category:** mediasoup-demo
**Created:** [July 3, 2020, 4:53pm UTC](https://mediasoup.discourse.group/t/candidate-doesnt-pairing-windows10/1385 "2020-07-03T16:53:23Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@amiznikov](https://mediasoup.discourse.group/u/amiznikov)
#### Post date: [July 3, 2020, 4:53pm UTC](https://mediasoup.discourse.group/t/candidate-doesnt-pairing-windows10/1385/1 "2020-07-03T16:53:23Z")
Hello, first thanks for mediasoup!
I got a problem, I installed mediasoup server and app local, then I started it by npm start
If I switch on forceTcp all will work well, but If I change to udp I can’t get candidate pair with succeeded. I also checked candidate(local and remote) and it’s right.
I switched off firewall and I checked udp port is available! Thanks for response anyway
---
### Author:  [@ibc](https://mediasoup.discourse.group/u/ibc)
#### Post date: [July 3, 2020, 5:26pm UTC](https://mediasoup.discourse.group/t/candidate-doesnt-pairing-windows10/1385/2 "2020-07-03T17:26:52Z")
This has been explained many times in this forum. Browsers do **not** accept UDP 127.0.0.1 ICE candidates. They do not try to connect to them.
---
### Author:  [@amiznikov](https://mediasoup.discourse.group/u/amiznikov)
#### Post date: [July 3, 2020, 5:51pm UTC](https://mediasoup.discourse.group/t/candidate-doesnt-pairing-windows10/1385/3 "2020-07-03T17:51:45Z")
Hm, when I changed config that part
```auto
{
listenIps :
[
{
ip : process.env.MEDIASOUP_LISTEN_IP || 'myIpHereNotLocalhost',
announcedIp : process.env.MEDIASOUP_ANNOUNCED_IP
}
],
```
It started to work. Sorry for inconvenience. And thanks a lot!