Copy-ready commandopenssl s_client
openssl s_client -connect example.com:443 -servername example.comRequirements and permissions
- Requirements
- Linux with the referenced utility installed
- Permissions
- Use sudo or root only when required
- Last reviewed
- 2026-07-31
Examples
Basic example
Inspect a TLS connection and certificate chain.
openssl s_client -connect example.com:443 -servername example.comCommon errors
Command not found
Confirm Linux with the referenced utility installed is installed and available in your current shell.