Ok so that works. But now I am back to my original problem. I think I didn't explained it clear enough. Because I left out some info that I didn't realized.
Firefox give me this error.
mydomain.com:7777 uses an invalid security certificate.
The certificate is not trusted because it is self-signed.
The certificate is only valid for Kloxo-MR
Error code: SEC_ERROR_UNKNOWN_ISSUER
But it doesn't give me the "Add Exception..." button. That's what was missing in the original post. I usually log in 7777 and got those error but I just have to "Add Exception..." and it's good. All my other domains on this VPS work fine. But this one. I have added the exception and it works. Then after awhile I get that error again but no "Add Exception..." button.
I've used ccleaner to clean out browsers and then it works. Then firefox work with it again after awhile it get the same error without the "Add Exception..." button.
I've tried delete my firefox profile and created new one but got the same result.
Again, this only happened with one domain.