36 Firefox very slow connection - says 'connection '. "- while the other browsers work

Since FF 36 users within our network have problems connecting to the web sites.
The entire page load time is in the range of Minutes.
Same behavior for different users after upgrade to FF36.
Create a profile - same behavior
With the help of the portable version - same behavior
enabled / disabled:
network.dns.disableIPv6
network.dns.disablePrefetch
Network.http.SPDY.Enabled.http2
Network.http.SPDY.Enabled.http2draft
-same behavior

Managed using F - Secure Client Security

No problem at all with Chrome and IE11.
Very strange - an idea?

Try to toggle network.dns.get - ttl to false on the topic: config page.

Tags: Firefox

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