Sublime Text Package Control Error 12029 and 12057 on Windows

Q: How do I fix "Sublime Text Package Control Error 12029 and 12057 on Windows"?

1. Fix errno 12029: Open Internet Options and reset Advanced settings to defaults In the Security section, make sure TLS 1.0, TLS 1.1 and TLS 1.2 are enabled 2. Fix errno 12057: In Internet Options > Advanced > Security, turn off the server certificate revocation check Restart your computer

Workaround available Windows Updated November 14, 2026How we research

Quick answer

On Windows, Package Control uses WinINet, so these errors are fixed in Internet Options: enable TLS 1.0-1.2 for 12029, turn off certificate revocation checking for 12057.

Most likely fix: Fix errno 12029

How to fix it

Try these in order — the most common fix is first.

1. Fix errno 12029
1. Open Internet Options and reset Advanced settings to defaults
2. In the Security section, make sure TLS 1.0, TLS 1.1 and TLS 1.2 are enabled
Did this fix it?
2. Fix errno 12057
1. In Internet Options > Advanced > Security, turn off the server certificate revocation check
2. Restart your computer
Did this fix it?

Symptoms

"Connection refused (errno 12029) during HTTP write phase of downloading" or "Error checking for server certificate revocation (errno 12057) during HTTP write phase of downloading".