Connman and DNS
However, I had really weird problems with DNS, where some hosts wouldn’t resolve.
$ ping outlook.office365.com PING outlook.office365.com (184.108.40.206) 56(84) bytes of data. 64 bytes from 220.127.116.11 (18.104.22.168): icmp_seq=1 ttl=238 time=44.7 ms 64 bytes from 22.214.171.124 (126.96.36.199): icmp_seq=2 ttl=238 time=44.6 ms 64 bytes from 188.8.131.52 (184.108.40.206): icmp_seq=3 ttl=238 time=44.8 ms ^C --- outlook.office365.com ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2003ms rtt min/avg/max/mdev = 44.625/44.755/44.890/0.267 ms $ ping smtp.office365.com ping: smtp.office365.com: Temporary failure in name resolution
We use Outlook 365 at work, please don’t judge me.
Switching back to NetworkManager solved the problem immediately, so now I can send all those enterprisey emails again. Good times.