Sorry for the delay @Maskian. I think the best option here would be to contact your ISP (referencing https://5107.playfabapi.com/). They will ultimately be best suited to assist with this.
There are some solutions you could try here, but I think your issue is beyond that: https://support.fatshark.se/hc/en-us/articles/360034654113--PC-How-to-Resolve-SIGN-IN-TIMEOUT-COULDNT-CONNECT-CONNECTION-TIMEOUT-COULDNT-RESOLVE-HOST-Errors-