This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Cuireadh an snáithe seo sa chartlann. Cuir ceist nua má tá cabhair uait.

Warning SSL_ERROR_BAD_CERT_DOMAIN because of an wrong port

more options

We have an internal company website on Port 1443. Firefox shows an error message that the certificate is not valid for server.domain:1443. It would be only valid for server.domain But the certificate is valid and the issuer is installed as certificate authority. Other browsers like Edge and Internet Explorer trust this website and show no warning. Has someone an idea, what's wrong with the certificate?

We have an internal company website on Port 1443. Firefox shows an error message that the certificate is not valid for server.domain:1443. It would be only valid for server.domain But the certificate is valid and the issuer is installed as certificate authority. Other browsers like Edge and Internet Explorer trust this website and show no warning. Has someone an idea, what's wrong with the certificate?

All Replies (1)

more options

Does nobody have an idea, why firefox misinterprets the portnumber as part of the DNS name?