Just change the time on the workstation from where you are trying to connect but make sure it's before July 2015 then the system loads and you can login. Once logged in please follow the steps as per instructions below:-
1. Upload the ESM-Login-Patch.tgz to the System Properties > File Maintenance > Software Update Files
2. Go to the System Properties > ESM Management > Maintenance > Terminal
3. Enter the following in the prompt and hit enter tar -xzvf /usr/local/ess/SoftwareUpdates/ESM-Login-Patch.tgz --directory /var/www/html
4. Remember to set the time back on your workstation.
Hope you're doing well.
I'll try this and would let you know about the results of it.