Network server

I can no longer access the KODI network server to install add-ons. I have used KODI 19 for a couple of years without any problems. The 2 days ago I was not able to find and episodes of tv series. I updated to 21 and now I can not install any add-on due to not being able to access the network server. All my other apps work fine and I have the same issue on android box, computer (ubuntu) and phone. Any information would be appreciated.