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I keep getting "Network Protocol Error" despite emptying the cache as recommended. I am running WIN10 on a HP desktop PC
I have emptied the cache as advised a number ot times but the error message persists. It is also accompanied by cannot find the server message. I am running WIN10 on a devolo network with BT as ISP.
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What site are you connecting to? Also this sounds more like Windows O/S issue not related to the Browser.
Modified by WestEnd
There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connection certificates and send their own.
hi geoff, there are a couple of similar other user reports, so we are looking into the issue in https://bugzilla.mozilla.org/show_bug.cgi?id=1528317.
are you able to trigger the error message somewhat reliably with particular steps? if so, could you please capture a http log while the problem is occurring which would help mozilla's developers understand what's going on and how to fix it: https://developer.mozilla.org/en-US/docs/Mozilla/Debugging/HTTP_logging#Using_aboutnetworking