Windows openssl TLS test equivalent in Linux
Connects to a TLS service and prints certificate details.
openssl TLS test
openssl s_client -connect host:443 -servername host
openssl s_client -connect host:443 -servername host
openssl s_client -connect host:443 -servername host
Overview
What this command does
On Windows, "openssl TLS test" is used to inspect TLS connection. On Linux, the closest practical mapping shown here is "openssl s_client -connect host:443 -servername host". Connects to a TLS service and prints certificate details. This reference is grouped under Networking → HTTP.
Windows → Linux context
What changes when you use this on Linux?
Same name, different environment
The basic command name openssl is familiar on both platforms, but Linux path rules, quoting, permissions and available options can still change the result.
Portable across the compared distros
The Debian/Ubuntu, Fedora and Arch rows use the same command in this mapping. Package availability or defaults can still vary, so check the installed tool version when an option behaves differently.
For the broader concept behind this mapping, read Linux networking for Windows users.
Practical tasks
Common use cases
Inspect TLS connection
Connects to a TLS service and prints certificate details.
openssl s_client -connect host:443 -servername host
Inspect TLS connection
openssl --help
Show command help when supported
man openssl
Open the manual page when installed
Ready to run
Copyable Linux commands
Review paths, device names, package names and permissions before running any command.
openssl s_client -connect host:443 -servername host
Walkthrough
Examples with explanations
# Windows equivalent: openssl TLS test
openssl s_client -connect host:443 -servername hostReference
Common options and variations
| Command or option | Use |
|---|---|
openssl s_client -connect host:443 -servername host | Inspect TLS connection |
openssl --help | Show command help when supported |
man openssl | Open the manual page when installed |
Distro differences
Debian/Ubuntu vs Fedora vs Arch
Debian/Ubuntu, Fedora and Arch all use "openssl s_client -connect host:443 -servername host" for this mapping. The command syntax shown here is portable across the three rows, although installed versions and system defaults can still vary.
| Distribution | Package manager / base | Equivalent command | Difference to notice |
|---|---|---|---|
| Debian/Ubuntu | same command | openssl s_client -connect host:443 -servername host |
Same command on this distribution. |
| Fedora | same command | openssl s_client -connect host:443 -servername host |
Same command on this distribution. |
| Arch | same command | openssl s_client -connect host:443 -servername host |
Same command on this distribution. |
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