In case someone has symptons with http websites that get ERR_CONNECTION_CLOSED
When we apply Advaced Threat Protection, websites which uses http protocol (internal and external) are often ERR_CONNECTION_CLOSED.
These http connections work good for 0-20minutes, but at certain time are closed.
This is only with http, not with https nor other protocols.
Which results the browser to ask for ntlmauthentication, refreshing the browser after the error directly opens the website again.
Since our user portal is turned off, it just gives the ERR_CONNECTION_CLOSED message.
The solution we have found is to turn off ATP. I'm not sure since which version this issue started, had it on 18.5.2, 18.5.3 and 19 (XG230)
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