My certificate is corrupted

i have just done a fresh install of ubuntu dapper and ispconfig, right after the install is done i am trying to login but get this message

Could not establish an encrypted connection because certificate presented by 192.168.1.116 is invalid or corrupted. Error Code: -8182​

How do i fix it ?

 

Have a look here: http://www.howtoforge.com/forums/showthread.php?t=121&highlight=firefox+8182