hi Maxgerhardt and pfeerick, tnx for the answer.
on a calm moment i disconnected my network and wifi and put my antivirus "Bitdefender to sleep.
I then try to do the same af before and my Uno board connected and did compile. I tried to connect with my Mega board and all went well. I then connected my esp Wroom 32 board and for this it had te connect to the internet to get some library files, so i had te wait for that.
in my bitdefender i turned bit by bit everything again on and in the section safe folders i have to add the folder .platfomio. turn back everythigh on in my virusscanner and connect to the internet.
so this problem is solved.
tnx again with putting me in the right direction.
sincerly
Preppie_be