NextDNS can't connect, Linuxlite/Ubuntu
Sep 06 08:44:53 Nexus systemd[1]: Started NextDNS DNS53 to DoH proxy..
 Sep 06 08:44:56 Nexus nextdns[849]: Starting NextDNS 1.36.0/linux on :53
 Sep 06 08:44:56 Nexus nextdns[849]: Starting mDNS discovery
 Sep 06 08:44:56 Nexus nextdns[849]: Cannot start mDNS: no interface found
 Sep 06 08:44:56 Nexus nextdns[849]: Listening on TCP/:53
 Sep 06 08:44:56 Nexus nextdns[849]: Listening on UDP/:53
 Sep 06 08:44:56 Nexus nextdns[849]: Startup failed: proxy: tcp: listen tcp :53: bind: address already in use
 Sep 06 08:44:56 Nexus nextdns[849]: Error: proxy: tcp: listen tcp :53: bind: address already in use
 Sep 06 08:44:56 Nexus systemd[1]: nextdns.service: Main process exited, code=exited, status=1/FAILURE
 Sep 06 08:44:56 Nexus systemd[1]: nextdns.service: Failed with result 'exit-code'.
 Sep 06 08:53:12 Nexus systemd[1]: Started NextDNS DNS53 to DoH proxy..
 Sep 06 08:53:12 Nexus nextdns[3331]: Starting NextDNS 1.36.0/linux on :53
 Sep 06 08:53:12 Nexus nextdns[3331]: Listening on TCP/:53
 Sep 06 08:53:12 Nexus nextdns[3331]: Starting mDNS discovery
 Sep 06 08:53:12 Nexus nextdns[3331]: Listening on UDP/:53
 Sep 06 08:53:12 Nexus nextdns[3331]: Startup failed: proxy: tcp: listen tcp :53: bind: address already in use
 Sep 06 08:53:12 Nexus nextdns[3331]: Error: proxy: tcp: listen tcp :53: bind: address already in use
 Sep 06 08:53:12 Nexus systemd[1]: nextdns.service: Main process exited, code=exited, status=1/FAILURE
 Sep 06 08:53:12 Nexus systemd[1]: nextdns.service: Failed with result 'exit-code'.
 Sep 06 08:55:36 Nexus systemd[1]: Started NextDNS DNS53 to DoH proxy..
 Sep 06 08:55:36 Nexus nextdns[4911]: Starting NextDNS 1.36.0/linux on :53
 Sep 06 08:55:36 Nexus nextdns[4911]: Listening on TCP/:53
 Sep 06 08:55:36 Nexus nextdns[4911]: Starting mDNS discovery
 Sep 06 08:55:36 Nexus nextdns[4911]: Listening on UDP/:53
 Sep 06 08:55:36 Nexus nextdns[4911]: Startup failed: proxy: tcp: listen tcp :53: bind: address already in use
 Sep 06 08:55:36 Nexus nextdns[4911]: Error: proxy: tcp: listen tcp :53: bind: address already in use
 Sep 06 08:55:36 Nexus systemd[1]: nextdns.service: Main process exited, code=exited, status=1/FAILURE
 Sep 06 08:55:36 Nexus systemd[1]: nextdns.service: Failed with result 'exit-code'.
 Sep 06 08:58:56 Nexus systemd[1]: Started NextDNS DNS53 to DoH proxy..
 Sep 06 08:58:56 Nexus nextdns[5016]: Starting NextDNS 1.36.0/linux on :53
 Sep 06 08:58:56 Nexus nextdns[5016]: Listening on TCP/:53
 Sep 06 08:58:56 Nexus nextdns[5016]: Starting mDNS discovery
 Sep 06 08:58:56 Nexus nextdns[5016]: Listening on UDP/:53
 Sep 06 08:58:56 Nexus nextdns[5016]: Startup failed: proxy: tcp: listen tcp :53: bind: address already in use
 Sep 06 08:58:56 Nexus nextdns[5016]: Error: proxy: tcp: listen tcp :53: bind: address already in use
 Sep 06 08:58:56 Nexus systemd[1]: nextdns.service: Main process exited, code=exited, status=1/FAILURE
 Sep 06 08:58:56 Nexus systemd[1]: nextdns.service: Failed with result 'exit-code'.
 
How to fix this problem?  i installing fresh linux lite and install nextDNS, 
  
3 replies
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  Looks like you have another program or another instance of nextdns running See "address already in use". Try to find with netstat which process is using port 53 
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  Did you ever resolve this? I'm having the same issue. 
- 
  This should help. 
 
 sudo systemctl stop systemd resolvedsudo systemctl disable systemd resolved 
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