The error occurs due to an incompatibility between the openssl-1.1.0c version used by the user and the CommuniGate Pro Suite server, which only supports SSLv3 protocol.Another possible cause is that the CommuniGate Pro Suite server has a configuration issue or a bug that prevents it from communicati

Software⏱️ 3 min read📅 2026-06-15

How to Fix error code 47 Error – s_client connection to server fails with ssl error code 47

Q: Best Solutions to Fix It Downgrade openssl version to resolve compatibility issues?

Step 1: Use a tool like apt-get or yum to downgrade the openssl package on the user's machine to a version that is compatible with the CommuniGate Pro Suite server.Step 2: For example, if the user is using Ubuntu-based Linux distributions, run the command "apt-get install openssl=1.0.2g". If they ar

Q: How do I fix: Contact server administrators to resolve configuration issues?

Step 1: Reach out to the server administrators of the CommuniGate Pro Suite server and report the issue.Step 2: Provide them with detailed information about the error, including the openssl version used by the user and any other relevant details.

Error code 47 occurs with openssl s_client connection to server fails due to sslv3 alert illegal parameter.

Quick Answer: Check if the CommuniGate Pro Suite supports TLS 1.2 or later, as OpenSSL 1.1.0c requires it.

📋 Table of Contents

⚠️ Common Causes
✅ Best Solutions to Fix It
🎯 Final Words

The s_client connection to server fails with SSL error code 47, affecting users who recently upgraded to openssl-1.1.0c and can no longer connect to their IMAP server at work.

This issue is frustrating for users as they are unable to access their email accounts, and the fact that it only occurs when using openssl-1.1.0c makes it difficult to diagnose and fix.

⚠️ Common Causes

The error occurs due to an incompatibility between the openssl-1.1.0c version used by the user and the CommuniGate Pro Suite server, which only supports SSLv3 protocol.
Another possible cause is that the CommuniGate Pro Suite server has a configuration issue or a bug that prevents it from communicating with clients using openssl-1.1.0c.

✅ Best Solutions to Fix It

Downgrade openssl version to resolve compatibility issues

Step 1: Use a tool like apt-get or yum to downgrade the openssl package on the user's machine to a version that is compatible with the CommuniGate Pro Suite server.
Step 2: For example, if the user is using Ubuntu-based Linux distributions, run the command "apt-get install openssl=1.0.2g". If they are using Red Hat-based Linux distributions, run the command "yum install openssl-1.0.2g".

Contact server administrators to resolve configuration issues

Step 1: Reach out to the server administrators of the CommuniGate Pro Suite server and report the issue.
Step 2: Provide them with detailed information about the error, including the openssl version used by the user and any other relevant details.

🎯 Final Words

To resolve the s_client connection failure with SSL error code 47, users can try downgrading their openssl version to a compatible version or contact server administrators to resolve configuration issues. If neither of these methods work, it may be necessary to seek further assistance from IT support.

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