I switched ISP, and now every site I try to visit I get the error message (on firefox)

Your connection is not secure

www.youtube.com uses an invalid security certificate. Thecertificate is only valid for the following names: * .edpnet.net,edpnet.net Error code: SSL_ERROR_BAD_CERT_DOMAIN

(edpnet being my ISP)

When I try to acces a site on Google Chrome, I get redirected to my ISP site with the message

There seems to be a problem with your internet connection

and in the tab it say's

There seems to be a problem with your modem

The modem I use is a Fritz!box 77430

Could somebody help me? It's friday evening & my ISP is closed until monday..

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