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SG200-50 no Web GUI after Firmware Update 1.4.11.2

I updated my switch from 1.4.10.x to 1.4.11.2

 

I can not connect to the https Web Gui! I'm getting error 400 and a blank page but the switch is still sending the configured certificate.

The http web Gui is disabled, so there is no way to connect to the switch.

Rebooting does not solve the problem.

 

Please help solving this issue.

 

EDIT: I can connect via https to the IP of the switch - crazy!!

https://switch.home.zz -> ERROR

https://192.168.77.77 -> SUCCESS

 

2. EDIT: I was able to enabled HTTP Service. But the same result!

http://switch.home.zz -> ERROR

http://192.168.77.77 -> SUCCESS

 

And no IPv6 is enabled in my network rather than on my PC

 

Greetz