Firefox giving following error, Websites prove their identity via certificates. Firefox does not trust this site because it uses a certificate that is not valid for '''192.168.1.100'''. The certificate is only valid for the following names: anishamsi.lan:6659, 192.168.1.100:6659, '''192.168.1.100''', anishamsi.lan I can see the url is there as listed by firefox error itself (verify with screenshot 1), the url is "https://192.168.1.100/api/validateLogin" please see the screenshot as well. First screenshot is for the error, second is for the certificate returned by the website and as shown by firefox. What is the error, i have created the certificate correctly. i am sure this is a bug in firefox?? If not!!! how u suggest i fix this i have added following alt names inside my csr. DNS.1 =anishamsi.lan:6659 DNS.2 =192.168.1.100:6659 DNS.3 =192.168.1.100 I have already uploaded the certificate at names screenshot.