After updating Firefox to latest version (V34 or higher), access the the DSS webGUI is blocked.

The problem is that the Firefox upgrade v34 and higher is disabling SSL v3. Current DSS V7 versions does not have this problem as default Security protocol is set to “Automatic” (SSL v3 + TLS), but some older DSS versions or updated from older may have this problem.
To fix the problem with Firefox v34 or higher, run another browser and if the DSS web GUI works, please modify Security protocol to “Automatic” (SSL v3 + TLS)" Setup-> Administrator settings->HTTPS security protocol set to “Automatic” (SSL v3 + TLS)
If you have no other browser which can access the DSS webGUI, you can modify Firefox to get access and modify Security protocol to “Automatic” (SSL v3 + TLS) in DSS.
In the Firefox URL field type:
about:config
and modify:        security.tls.version.min;1
please change the value from 1 to 0

After this modification to Firefox, you will be able to access the DSS webGUI, and make appropriate adjustments.
You may then undue the modification to Firefox

.