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After connecting to WLAN, DNS queries don't work due to incorrect routes to DNS servers (in this example the servers are 62.xxx.xxx.245, 62.xxx.xxx.246, 2001:14b8:1000:0:x:x:x:1, 2001:14b8:1000:0:x:x:x:2; addresses are mangled with x manually):

# ip r sh
default via 192.168.0.1 dev wlan0 
62.xxx.xxx.245 dev wlan0  scope link
62.xxx.xxx.245 via 192.168.0.1 dev wlan0 
62.xxx.xxx.246 dev wlan0  scope link 
62.xxx.xxx.246 via 192.168.0.1 dev wlan0 
192.168.0.0/24 dev wlan0  proto kernel  scope link  src 192.168.0.12 
192.168.0.1 dev wlan0  scope link 
# ip -6 r sh
2001:14b8:1000:0:x:x:x:1 dev wlan0  metric 1 
2001:14b8:1000:0:x:x:x:2 dev wlan0  metric 1 
2001:14ba:16fe:xxxx::/64 dev wlan0  proto kernel  metric 256 
unreachable fe80::/64 dev lo  proto kernel  metric 256  error -101
fe80::/64 dev wlan0  proto kernel  metric 256 
default via fe80::x:x:x:x dev wlan0  proto kernel  metric 1024  expires 1794sec
# ip a sh
...
11: wlan0: <BROADCAST,MULTICAST,DYNAMIC,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 100
...
    inet 192.168.0.12/24 brd 192.168.0.255 scope global wlan0
    inet6 2001:14ba:16fe:x:x:x:x:x/64 scope global 
       valid_lft forever preferred_lft forever
...

If "dev wlan0" routes to DNS servers are removed manually, everything works ok. Not sure if it is related, but the problem seemed to appear at the same time when the operator (DNA Welho) enabled IPv6. Other tested devices work ok (Symbian, Fedora Linux).

There are some errors in journal:

kesä 02 20:06:27 Jolla kernel: wlan0: IPv6 duplicate address 2001:14ba:16fe:x:x:x:x:x detected!
...
kesä 02 20:06:29 Jolla connmand[696]: Adding host route failed (No such process)
kesä 02 20:06:29 Jolla connmand[696]: Adding host route failed (No such process)
kesä 02 20:06:29 Jolla connmand[696]: Set IPv6 host route error (Invalid argument)
kesä 02 20:06:29 Jolla connmand[696]: Set IPv6 host route error (Invalid argument)

After connecting to WLAN, DNS queries don't work due to incorrect routes to DNS servers (in this example the servers are 62.xxx.xxx.245, 62.xxx.xxx.246, 2001:14b8:1000:0:x:x:x:1, 2001:14b8:1000:0:x:x:x:2; addresses are mangled with x manually):

# ip r sh
default via 192.168.0.1 dev wlan0 
62.xxx.xxx.245 dev wlan0  scope link
62.xxx.xxx.245 via 192.168.0.1 dev wlan0 
62.xxx.xxx.246 dev wlan0  scope link 
62.xxx.xxx.246 via 192.168.0.1 dev wlan0 
192.168.0.0/24 dev wlan0  proto kernel  scope link  src 192.168.0.12 
192.168.0.1 dev wlan0  scope link 
# ip -6 r sh
2001:14b8:1000:0:x:x:x:1 dev wlan0  metric 1 
2001:14b8:1000:0:x:x:x:2 dev wlan0  metric 1 
2001:14ba:16fe:xxxx::/64 dev wlan0  proto kernel  metric 256 
unreachable fe80::/64 dev lo  proto kernel  metric 256  error -101
fe80::/64 dev wlan0  proto kernel  metric 256 
default via fe80::x:x:x:x dev wlan0  proto kernel  metric 1024  expires 1794sec
# ip a sh
...
11: wlan0: <BROADCAST,MULTICAST,DYNAMIC,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 100
...
    inet 192.168.0.12/24 brd 192.168.0.255 scope global wlan0
    inet6 2001:14ba:16fe:x:x:x:x:x/64 scope global 
       valid_lft forever preferred_lft forever
...

If "dev wlan0" routes to DNS servers are removed manually, everything works ok. Not sure if it is related, but the problem seemed to appear at the same time when the operator (DNA Welho) enabled IPv6. Other tested devices work ok (Symbian, Fedora Linux).

There are some errors in journal:

kesä 02 20:06:27 Jolla kernel: wlan0: IPv6 duplicate address 2001:14ba:16fe:x:x:x:x:x detected!
...
kesä 02 20:06:29 Jolla connmand[696]: Adding host route failed (No such process)
kesä 02 20:06:29 Jolla connmand[696]: Adding host route failed (No such process)
kesä 02 20:06:29 Jolla connmand[696]: Set IPv6 host route error (Invalid argument)
kesä 02 20:06:29 Jolla connmand[696]: Set IPv6 host route error (Invalid argument)