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[ZT] Max SSH session duration #23402

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merged 5 commits into from
Jul 9, 2025
Merged

[ZT] Max SSH session duration #23402

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d801b92
max SSH session duration
ranbel Jul 2, 2025
2416477
edit wording
ranbel Jul 2, 2025
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edit paragraph spacing
ranbel Jul 2, 2025
645efcb
replce controlpersist with channeltimeout
ranbel Jul 8, 2025
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edit wording
ranbel Jul 8, 2025
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6 changes: 6 additions & 0 deletions ...re-one/connections/connect-networks/use-cases/ssh/ssh-infrastructure-access.mdx
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Expand Up @@ -155,10 +155,16 @@ To set up the Logpush job, refer to [Logpush integration](/cloudflare-one/insigh

## Known limitations

### SSH features

The following SSH features are not supported:

- `sftp` commands
- `scp` commands that utilize OpenSSH versions > 9.0, because OpenSSH 9.0+ leverages `sftp` to execute the command
- Local and remote port forwarding
- SSH agent forwarding
- X11 forwarding

### Session duration

SSH sessions have a maximum expected duration of 10 hours. For more information, refer to the [Troubleshooting FAQ](/cloudflare-one/faq/troubleshooting/#long-lived-ssh-sessions-frequently-disconnect).
15 changes: 15 additions & 0 deletions src/content/docs/cloudflare-one/faq/troubleshooting.mdx
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Expand Up @@ -374,3 +374,18 @@ Get-ChildItem -Path "HKLM:\SOFTWARE\Microsoft\NET Framework Setup\NDP" -Recurse
## I get an `Invalid session. Please try logging in again.` error from Access when trying to log in to the Cloudflare dashboard via SSO.

Cloudflare Access uses a [`CF_Session` cookie](/cloudflare-one/identity/authorization-cookie/#access-cookies) to validate that the same browser both initiated and completed your sign-in. The `Invalid session` error means Access was unable to validate this cookie. Ensure that there is no software or firewall on your device or network that may be interfering with requests to Access.

## Long-lived SSH sessions frequently disconnect.

All SSH connections proxied through Cloudflare Gateway, including traffic to [Access for Infrastructure](/cloudflare-one/connections/connect-networks/use-cases/ssh/ssh-infrastructure-access/) targets, have a maximum expected duration of 10 hours. This is because Gateway terminates connections over 10 hours when releasing service updates; releases are not scheduled and can occur multiple times a week.

To ensure a consistent user experience, we recommend configuring your environment to automatically terminate sessions over 10 hours. For example, you could require users to sign in once a day so that connections do not cut off unexpectedly during the work day. One option is to add [`ControlPersist`](https://man.openbsd.org/ssh_config#ControlPersist) to your personal (`~/.ssh/config`) or global (`/etc/ssh/ssh_config`) SSH client configuration file:

```txt
Host *
ControlMaster auto
ControlPath ~/.ssh/control_sockets/%r@%h:%p
ControlPersist 10h
```

`ControlPersist` will close inactive SSH connections on the client machine after the specified time period.
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