I figured out, that if I restart network-manager ("sudo restart network-manager" does that in a terminal), I am able to connect again with the broadband modem.
So the current work flow goes like this:
-connecting to the net works fine the first time, but does not work after being disconnected once;
-after restarting network-manager, connecting is possible again.
(Maybe some cleanup activity fails upon disconnecting?)
I figured out, that if I restart network-manager ("sudo restart network-manager" does that in a terminal), I am able to connect again with the broadband modem.
So the current work flow goes like this:
-connecting to the net works fine the first time, but does not work after being disconnected once;
-after restarting network-manager, connecting is possible again.
(Maybe some cleanup activity fails upon disconnecting?)