Good evening Sujatha,
thank you for your hints.
I tested my system in the manner, you proposed.
In safe mode networking is OK !
In normal mode - after unininstalling Norton 360 - the error occurs once more ! Why do you think, that
antivirus program is the evil - doer ?
One of the other programs installed must be reason ! Can you propose a strategy, how to find out
the disturbing program ?
Thanks
manaledi