With the release of Chrome 45.0.2454.85 m and Firefox 40.0.3 security measures have been introduced that prevent browsing to LabTutor Server admin pages.
Error messages are displayed as follows:
Server has a weak ephemeral Diffie-Hellman public key
Secure Connection Failed
An error occurred during a connection to mattg-win8.modern.adi.co.nz. SSL received a weak ephemeral Diffie-Hellman key in Server Key Exchange handshake message. (Error code: ssl_error_weak_server_ephemeral_dh_key)
To rectify this issue the following adjustments can be made to LabTutor Server:
1) Navigate to the LabTutor Server installation directory and locate the tomcat configuration folder. This is usually located here: C:\Program Files (x86)\ADInstruments\LabTutor Server\tomcat\conf
2) Make a backup copy of the server.xml file
3) Replace the server.xml file with version attached to this case.
4) Restart LabTutor