unable to access some websites when connected to my home network

[alistairb]

I have a number of websites that are hosted on a server in the UK. When connected to my home network, I cannot access these sites.

On my phone I cannot access them either, as soon as I turn off wifi and switch to cellular then access is immediate.

https://109.203.125.112:8443/

that is my control panel login for my hosting server, but I simply get a message that the site cannot be reached

[EG]

Try disabling the Xfi Advanced Security feature as a work-around for now and see. It's buggy ! And there is currently no way for an end-user to be able to whitelist anything;

https://www.xfinity.com/support/articles/using-xfinity-xfi-advanced-security

[BruceW]

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@alistairb wrote: ... https://109.203.125.112:8443/ ... the site cannot be reached

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Note that when I try to follow that link in Firefox I get:

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Warning: Potential Security Risk Ahead

Firefox detected a potential security threat and did not continue to 109.203.125.112. If you visit this site, attackers could try to steal information like your passwords, emails, or credit card details.

Websites prove their identity via certificates. Firefox does not trust this site because it uses a certificate that is not valid for 109.203.125.112:8443. The certificate is only valid for the following names: *.specialservers.com, specialservers.com

Error code: SSL_ERROR_BAD_CERT_DOMAIN

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