kcavender 10.10.7.200 is private address (Check below i have given a small info about this) within your network, I think that is where you need to supply the log in credentials given to you by the authority in order to access internet, right. Since your access to internet is blocked before loging in Firefox is not able to verify the validity of the certificate, You can Add Exception in Firefox that will solve this issue and because this is in Local network there minimal Security Risks too (Only if some one in your local network breaks your communication). '''For your info ''' They are only intended for use within a private context and traffic that needs to cross the Internet will need to use a different, unique address.