This is an original planning guide. It is not a vendor manual, an official standard, or legal advice. Example addresses use documentation ranges. Review every command before you paste it.
What this hour is for
The checker opens a handshake to one name you type and reports the version and the suite it saw. The name is a host you administer, or a single public name tied to a ticket. It is not a range and not a search for weak servers on the internet.
Old versions are a finding you write down. The fix is a configuration change on that host, later, with a rollback. Do not disable TLS inspection you do not operate, and do not use the result as a list of targets.
A bulk expiry check is still a list you are allowed to hold, such as your own certificate inventory. Do not feed it a list of other people's names.
The result is not a penetration test and not a certification.
The change you can finish
Apply nothing during the writing of the note. When the lab window opens, it is one change on the device named in the ticket. Read the draft, then the device, then decide.
Rollback is the file or the revision you saved first. You do not invent a rollback after the only copy is gone.
- Name one host you administer.
- Read the version and one suite.
- Write the gap.
- Hand the change to a later ticket.
- Do not scan a range.
- Do not keep a list of other people's hosts.
Mistakes that outlive the command
How to Check TLS Versions and Ciphers goes wrong in a small set of ways. The list is here so the ticket can forbid them before the window.
- A scan of addresses you do not administer.
- A target list built from weak results.
- Calling the check a certification.
- Changing the live listener in the reading hour.
Decisions to write down
One decision for How to Check TLS Versions and Ciphers: The host is yours. The version is written. The fix waits. No range was scanned. And this is not a certification.
Checks before you call it done
Confirm this before you call the change done: One hostname is in the note. The version is recorded. No scan was run. The listener was not changed yet. And the next ticket is named. If one of those fails, stop.
Before you leave the device
How to Check TLS Versions and Ciphers ends when the hostname on the device matches the hostname in the ticket. If it does not, you are on the wrong box. Stop. A command that succeeded on the wrong box is not progress.
The draft stays a draft until a person has read the names in it. A generator does not log into the device and does not know which interface is the uplink. You delete a line that names a device, a zone, or a prefix you did not write down.
0.0.0.0/0 is not kept because a sample included it. A source you can say is the source you keep. 192.0.2.0/24, 198.51.100.0/24, 203.0.113.0/24, and 2001:db8::/32 are documentation. They belong in the note. They are not prefixes you type onto a production device because they appeared in a draft.
prompt-for-this is a reminder that a secret is missing. It is not a password, a key, a community string, or a pre-shared key you save in the ticket or in git. The real secret stays in the store.
One change is the window. A VLAN and a routing protocol and a VPN do not share it. If two things move and the result is wrong, you will not know which one did it. The next feature waits for its own page.
If the same step fails twice, stop for the day. The failure is the result. Adding a forum command beside a half-applied config produces a device nobody can rebuild. Restore the copy you took first.
A second person reads the device name and the change aloud. If they cannot find them in the ticket, the note is not done. Silence is not agreement. Then leave the device alone.
This page is a planning guide. It is not a vendor manual, not an official standard, and not a permission to touch a network you do not administer. The pillar guide owns the wider design. This page owns one lab proof.
Tools for this guide
These tools run in the browser on this site. They do not log into your machines.
Related pillar guides
More in this cluster
The pillar for this page, and the next published pages filed with it.
- Pillar: Network Troubleshooting Guide
- Explainer: HTTP/3 and QUIC Explained
- How-To: How to Run an Accurate Internet Speed Test
- Troubleshooting: Path MTU Discovery and MTU Problems
Companion: Security: How SSL/TLS Works.