I tried it via firefox on a linux-laptop, and the firefox blocks the connection " because of unsecure connection via a gate not used for normal http "
maybe the problem lies in that corner?

@phaedrux ,
For an unknown reason the connection came back !!
I tested it 10 times , and no more problems. The bad side is, that I don't know the solution, if it happens again one day...
Thanks for the help anyway ,
best regards,
Jules

@phaedrux ,
good morning,
the crazy thing is that both communications are via wi-fi !
I changed the browser also , I scrapped the password, and deactivated the firewall, and still no change.

I have full control via tablet and cell phone

@jay_s_uk ,
I can send m122 from my tablet and I get all the data back

Hi,
my wifi connection via pc to DWC is broken, but it works via my tablet and smartphone ! I tried by changing the dns setting ,but I still get the time-out message. I tried also to connect via http://printername.local .
I guess it's a windows or firewall problem
Anybody an idea ?