stream_socket_client(): SSL operation failed with code 1. OpenSSL Error messages: error:0A00010B:SSL routines::wrong version number
Stefan Izdrail
Founder & Senior Architect · 2026-06-29
Title: Troubleshooting SSL Operation Failures with stream_socket_client() in Laravel Applications
Body:
If you are experiencing issues while sending emails in your Laravel application using Mailtrap and encountering the error message "stream_socket_client(): SSL operation failed with code 1. OpenSSL Error messages: error:0A00010B:SSL routines::wrong version number" from stream_socket_client(), this blog post aims to provide a comprehensive guide on troubleshooting these issues and offer insights into the possible causes.
Understanding the Error Message
The error message indicates that there is an issue in establishing the SSL connection with the specified host. It signals that either your Laravel application or the remote mail server's configuration or environment might not be correct. The error code 1 and the OpenSSL warning message suggest a mismatch between the versions of the SSL libraries used by both sides.Possible Causes
There are several reasons that can cause this issue, and they include: - Outdated PHP version or extensions: An outdated or incompatible PHP version or missing SSL/TLS libraries may lead to this error. Ensure you are using the latest PHP version supported by your Laravel application. - Incorrect hostname: A misconfigured DNS server could result in an incorrect hostname being set for the remote SMTP server. Make sure that you're using the correct hostname and port configuration. - Outdated or misconfiguration of OpenSSL: If you are experiencing this issue with your local development environment, chances are that your OpenSSL library is outdated or misconfigured. Ensure you have the latest version installed. - Misconfiguration in Mailtrap credentials: Check that the username and password provided for your Mailtrap account are correct. Incorrect credentials might also cause SSL issues.Troubleshooting Steps
To resolve this issue, you can try the following steps: 1. Update your PHP version: To ensure smooth communication and compatibility with OpenSSL libraries, make sure you are using the latest stable release of PHP compatible with your Laravel application. If necessary, update your environment's configuration to support the newer version. 2. Check your OpenSSL library version: Ensure that you have installed the latest version of the OpenSSL library. To verify your current version, run:php -r "echo exec('openssl version -d');". If it is outdated or not compatible with your PHP version, update it using your operating system's package manager or download and compile the source code from the official repository.
3. Reconfigure your local DNS server: In case of misconfigured DNS servers, you should contact your internet service provider (ISP) or network administrator to ensure that the correct hostname is set for the remote SMTP server. Alternatively, you can try using a third-party DNS provider such as Google Public DNS or Cloudflare DNS for better connectivity.
4. Confirm Mailtrap credentials: Make sure you are entering the correct username and password for your Mailtrap account when configuring your Laravel application's .env file. If necessary, log in to Mailtrap with another email account and generate new credentials.
5. Verify SSL/TLS configurations: Check that both your local development environment and the remote SMTP server are using compatible versions of SSL/TLS protocols. Ensure that your Laravel application is configured to use TLS encryption for better security and compatibility.