My network seems to work flawlessly. However, I am sitting behind a proxy. When
checking the logs I get every other time:

Nov 21 08:46:52 PC-JURZITZA7 NetworkManager[1304]: <info>  connectivity: check
for uri 'http://conncheck.opensuse.org' failed with 'Could not connect: Socket
I/O timed out'

even though curl -I http://conncheck.opensuse.org works (apparently) as
expected:

fred@PC-JURZITZA7:/etc/NetworkManager> curl -I http://concheck.opensuse.org
HTTP/1.0 404 Not Found
Date: Mon, 21 Nov 2016 07:50:35 GMT
Content-Type: text/html
Content-Length: 1226

Could it probably be that the software performing those checks does not honor
the proxy settings appropriately?

Thank you for looking into this,
take care





Dieter Jurzitza