WSUS connection error: Reset Server Node

WSUS GUI console could give sometimes connection error. 

It could be because of stopped Application Pool in IIS.

You can create batch file that will cure the situation by starting Application Poll and WSUS console.

You may change the batch in accordance to your environment.

With this line you can check where the MMC folder is resides.
%AppData%\Microsot\MMC

==Start of Batch==

IISRESET
Timeout /T 5

C:
::
CD C:\Users\vlad\AppData\Roaming\Microsoft\MMC
del wsus

CD C:\Windows\System32\inetsrv
appcmd start apppool wsuspool

CD C:\Program Files\Update Services\AdministrationSnapin\
start /B wsus.msc

==End of Batch==

Run the batch as a administrator.

But it is better to solve the problem for ever then temporarily remediate it.

Change the IIS Application Pool definitions in accordance with the next pictures.

That's all!