Hi Richard,

Some anti-virus software is known to block any streaming HTML connection. It seems that this new version of Sophos is doing that. In other words, this software wants to download the full HTTP response before making it available to the browser. Obviously, this behavior is not compatible with a streaming paradigm.

That's why Lightstreamer has the "stream-sense" feature, which automatically switches to smart polling whenever something in the middle block streaming. Consider that smart polling is highly efficient in Lightstreamer and in many cases the final user cannot distinguish it from real streaming.

You could also try to use HTTPS instead of HTTP. In many cases, when facing HTTPS, the anti-virus accepts to forward the response in real-time.