You may want to update/change or add a .conf file which you will find/can make in the Guncoin folder which would be under your "User name here"/AppData/Roaming/ folder.
In order to make that file, you can start with a regular .txt file then change the extension to ".conf" if need be.
Place that file in the Guncoin folder, then restart the wallet.
Here is where you may find some node lists: https://chainz.cryptoid.info/gun/#!network
Thx for yout help.
I created a Guncoin.conf with all these node:
addnode=104.237.4.26
addnode=142.197.219.57
addnode=158.69.248.93
addnode=167.114.249.196
addnode=176.31.126.191
addnode=184.164.129.202
addnode=188.165.194.146
addnode=204.27.59.90
addnode=212.3.192.248
addnode=31.208.181.125
addnode=51.254.45.117
addnode=72.185.23.235
addnode=76.64.78.208
addnode=78.42.198.233
addnode=84.2.153.98
Still no luck!
Looking in the debug log I found this:
2017-07-02 18:13:13 3 addresses found from DNS seeds
2017-07-02 18:13:13 dnsseed thread exit
2017-07-02 18:13:13 trying connection 50.7.47.93:42954 lastseen=122.2hrs
2017-07-02 18:13:18 connection timeout
2017-07-02 18:13:19 trying connection 199.127.225.103:42954 lastseen=113.0hrs
2017-07-02 18:13:24 connection timeout
2017-07-02 18:13:30 trying connection 195.95.21.241:42954 lastseen=118.3hrs
2017-07-02 18:13:35 connection timeout
So what happens is that it takes only 3 adresses from seed.guncoin.info and in a infinite loop try to connect to them, it doesn't look in my .conf even if I launch the applicatyion with -conf fullpath to Guncoin.conf