I just installed a new box with ISPConfig 2.2.29 - Ubuntu 64 bit 8.1 server. I followed the perfect install to the letter. No errors during installation. Set system to access ISP config via https. http either using the web address or the ip address brings the expected "It Works!" response. https either using the web address or the ip address, of course with :81 brings the following page: Secure Connection Failed An error occurred during a connection to xxxx:81. Peer's certificate has an invalid signature. (Error code: sec_error_bad_signature) Ok.. so what did I miss??