Here are a few title options for your article, focusing on the \'question\' aspect: **Direct & Specific:** * **\'cURL ERROR: Recv failure: Connection reset by peer - How do I diag

CURL ERROR: Recv failure: Connection reset by peer - PHP Curl

This error arises when the remote server drops the connection abruptly instead of performing the standard handshake.

Possible Causes:

1. TCP/IP Issue: Contact your host or update your OS.
2. Kernel Bug: Linux kernels after v2.6.17 may have TCP window scaling problems.
3. PHP & CURL Bug: Consider upgrading to later versions of PHP/CURL.
4. Maximum Transmission Unit (MTU): Check if the MTU size has changed from the default 1500 bytes.
5. Firewall (iptables): Verify access to port 80 on the remote server and inspect firewall rules.

Experiments:

• Test the script on a different server.
• Temporarily allow all incoming connections and check if the issue persists.

Code-Related Considerations:

• SSL: Ensure proper SSL settings if the remote URL uses HTTPS.

Resolution:

Depending on the cause, the following steps may resolve the issue:

• Upgrade your kernel, PHP, and CURL versions.
• Adjust the MTU settings.
• Configure the firewall or contact your hosting provider.
• Set CURLOPT_SSL_VERIFYPEER and CURLOPT_SSL_VERIFYHOST to false for SSL connections.

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