求助：近2-3周多平台访问bitbucket.org均出现SSL_ERROR_SYSCALL

Hey there, let's work through this frustrating SSL connectivity issue with bitbucket.org together. I’ve helped troubleshoot similar problems before, so here’s a breakdown of actionable fixes tailored to your Mac OS 10.13.4 and Windows 7 systems:

1. Flush DNS Cache Across Both Systems #

DNS corruption is a common culprit for cross-device connectivity issues. Let’s clear it out:

• Mac OS 10.13.4: Open Terminal and run:

  sudo killall -HUP mDNSResponder
  

  Enter your admin password when prompted (it won’t show as you type—this is normal).
• Windows 7: Launch Command Prompt as Administrator, then run:

  ipconfig /flushdns
  

2. Manually Map Bitbucket’s IPs in Your Hosts File #

If DNS resolution is failing to grab the correct addresses, adding direct IP entries can bypass the issue:
First, confirm Bitbucket’s current IPs by running nslookup bitbucket.org in Terminal/Command Prompt. Then:

• Mac: Edit the hosts file with:

  sudo nano /etc/hosts
  

  Add lines like these (replace with the IPs you found):

  18.205.93.0 bitbucket.org
  18.205.93.1 api.bitbucket.org
  

  Save with Ctrl+O, exit with Ctrl+X, then flush your DNS again (step 1).
• Windows 7: Open Notepad as Administrator, then open C:\Windows\System32\drivers\etc\hosts. Add the same IP lines above, save the file, and restart your browser/git client.

3. Rule Out Local Firewall/Antivirus Blocks #

Even without a proxy, security tools can silently block outbound SSL connections to port 443:

• Temporarily disable your antivirus and firewall on both systems, then test accessing bitbucket.org via browser, curl, or git push.
• If the connection works, add a permanent exception for bitbucket.org (port 443) in your security software settings.

4. Update SSL/TLS Components #

Outdated SSL libraries often cause handshake failures:

• Mac: While macOS includes LibreSSL, you can install a newer OpenSSL version via Homebrew (if you have it):

  brew install openssl
  

  Test the connection with the updated tool:

  echo | /usr/local/opt/openssl/bin/openssl s_client -connect bitbucket.org:443
  

• Windows 7: Enable TLS 1.2 (Bitbucket requires this):
  1. Open Internet Options > Advanced tab.
  2. Under Security, check "Use TLS 1.2" (uncheck older versions like TLS 1.0 if needed).
  3. Install all pending Windows updates to ensure your system has the latest security patches.

5. Test with a Mobile Hotspot #

You mentioned switching ISPs, but try connecting via a mobile hotspot to rule out regional restrictions or ISP-level blocks. If the connection works with mobile data, reach out to your ISP to ask if they’re blocking Bitbucket’s IP range.

After trying these steps, re-run the echo | openssl s_client -connect bitbucket.org:443 command and share the full output if you’re still stuck—this will help narrow down the root cause further.

内容的提问来源于stack exchange，提问作者Daniyar