Kinda sounds like an antivirus incompatibility. You said it works if you pause Avast, correct? If that's the case, then it likely is an incompatibility. If so, you might try looking in Avast's options for an option called scan SSL or scan HTTPS and try disabling it and see if it works then.
No problem with any web browsers. This is just a type of network driver that shall be used. Sometimes some of the antiviruses may use the same or different type of driver that can cause incompatibility issues.