Hi What is the address of the website that you are trying to view? What is the error message that you are seeing?

Your question title is "Firefox stopped accessing any server due to some security issue". That tells me that the problem is with any website you try to visit. If so, see the '''If the error occurs on multiple secure sites''' section of the [[Troubleshoot security error codes on secure websites]] article. The '''Possible solutions''' section of the [[Secure connection and security warning error pages in Firefox]] article may also help.