Network · medium

How to fixERR-SSL-PROTOCOL-ERR

Secure connection (SSL) error

What this error means

ERR-SSL-PROTOCOL-ERR shows up as a medium-severity network adapter fault. The browser refuses to load the web page due to an HTTPS/SSL error. Typical causes include the date and time are incorrectly set on the computer, anti-virus programs (e.g. ESET, Avast) scan SSL transmission poorly and outdated operating system without root certificates. See the troubleshooting steps below for the fix.

Before you begin

Save open work and back up important files. Note any recent driver or hardware changes. If Windows cannot start, use the startup guide first.

Work through these checks

0 of 3 complete
01Synchronize time in Windows (NTP)

Synchronize time in Windows (NTP).

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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02Turn off 'HTTPS Scan' in the antivirus

Turn off 'HTTPS Scan' in the antivirus.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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03Try clearing your browser's cache and cookies

Try clearing your browser's cache and cookies.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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Possible causes

  • The date and time are incorrectly set on the computer
  • Anti-virus programs (e.g. ESET, Avast) scan SSL transmission poorly
  • Outdated operating system without root certificates