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:
-
TCP/IP Issue: Contact your host or update your OS.
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Kernel Bug: Linux kernels after v2.6.17 may have TCP window scaling problems.
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PHP & CURL Bug: Consider upgrading to later versions of PHP/CURL.
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Maximum Transmission Unit (MTU): Check if the MTU size has changed from the default 1500 bytes.
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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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