I can't log into voobly anymore. I tried deleting and reinstalling Voobly, restarted my PC and router and kept the firewalls deactivated. I can only get in using a VPN connection, but obviously it's much slower.
Any solution to play normally as before without using a VPN server? Thanks in advance.

1x5 or 5x0 are client side issues, e. g. unable to resolve DNS names or an AntiVirus / Firewall blocking outgoing traffic. Try rebooting your router e. g. unplug and replug the power cable for 10 seconds.

Thanks Chris, I did what you suggested, but the problem persists. Do you have any other advice please? Could I have been banned?

What's your OS version? Start > Run > winver

i have windows 7

Try resetting the Windows Defender Firewall:
[You must login to view link]

done, but still the same error

Please show me the output of
Start > run > type "cmd" > click enter

nslookup client.voobly.com

AND (this may take a while)

tracert client.voobly.com

Take two screenshots and upload them here at the forums. Click reply instead of using quick reply below and upload both files.

iìve done what you have said. Those are the screenshots of CMD.