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Ok, got it to work by disabling IPv6. Thanks again!

Thanks for the pointer to the CA certs! Which certificates did you have to import to make it work in the end? This is what I have now:C=BE, O=GlobalSign nv-sa, OU=Root CA, CN=GlobalSign Root CAC=BE, O=GlobalSign nv-sa, OU=Root CA, CN=GlobalSign Root ...