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ESET AV is known to have this feature enabled by default. In this case, you should be able to fix the issue by accessing the advanced settings of your AV and disabling protocol filtering. Firefox Error PR_CONNECT_RESET_ERRORĪs it turns out, TCP protocol filtering can be responsible for interrupting the connection between the end-user (you) and the webserver you’re attempting to access due to a false positive.
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This error message essentially means that the peer or some middlebox in between (most likely a firewall) is terminating the connection forcibly. The PR_CONNECT_RESET_ERROR issue is encountered when the user tries to use Mozilla Firefox to connect to a website server with the HTTPS protocol but the request gets denied.
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