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ConPTY(?) inserts broken control codes into tmux sessions. #10006

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opened 2026-01-31 02:09:55 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 02:09:55 +00:00
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Originally created by @Efreak on GitHub (Aug 5, 2020).

Environment

Windows build number: Microsoft Windows [Version 10.0.18363.959]
Windows Terminal version (if applicable): N/A.

Any other software?
OpenSSH_for_Windows_7.7p1, LibreSSL 2.6.5
tmux 2.6

Steps to reproduce

Open an ssh (other?) session with a running tmux session with default configuration.

Expected behavior

tmux session opens as you've left it.

Actual behavior

tmux opens with 1;0c appended to whatever was at the prompt/cursor previously. Applications that consume control characters attempt to do something with them. (I haven't run into any issues with that yet, but it's possible; mostly I'm just in nano, which only complains about Unknown sequence).

Fix

Add a line to tmux.conf: set -s escape-time 10. Do this on every remote server you log into.

I should note that this is not actually an issue with WT per say--it also affects cmd.exe (which is what I primarily use for quick, single-command sessions). However, the fix I found was located
here, which links to here as the correct place to file an issue.

Screenshots

Screenshots

Connecting to my laptop running Ubuntu 18.04.3 via WSL
Running on my laptop in WSL

Running on a remote VPS with Ubuntu 18.04.3:
Running on a remote actual-linux server

If nano is running, I get a ding and an Unknown sequence message:
Opening a session that has nano running
This one with a running editor has gotten me several times before, as I tend to leave files open, sometimes with modifications to finish later.

Originally created by @Efreak on GitHub (Aug 5, 2020). <!-- 🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨 I ACKNOWLEDGE THE FOLLOWING BEFORE PROCEEDING: 1. If I delete this entire template and go my own path, the core team may close my issue without further explanation or engagement. 2. If I list multiple bugs/concerns in this one issue, the core team may close my issue without further explanation or engagement. 3. If I write an issue that has many duplicates, the core team may close my issue without further explanation or engagement (and without necessarily spending time to find the exact duplicate ID number). 4. If I leave the title incomplete when filing the issue, the core team may close my issue without further explanation or engagement. 5. If I file something completely blank in the body, the core team may close my issue without further explanation or engagement. All good? Then proceed! --> <!-- This bug tracker is monitored by Windows Terminal development team and other technical folks. **Important: When reporting BSODs or security issues, DO NOT attach memory dumps, logs, or traces to Github issues**. Instead, send dumps/traces to secure@microsoft.com, referencing this GitHub issue. If this is an application crash, please also provide a Feedback Hub submission link so we can find your diagnostic data on the backend. Use the category "Apps > Windows Terminal (Preview)" and choose "Share My Feedback" after submission to get the link. Please use this form and describe your issue, concisely but precisely, with as much detail as possible. --> # Environment ```none Windows build number: Microsoft Windows [Version 10.0.18363.959] Windows Terminal version (if applicable): N/A. Any other software? OpenSSH_for_Windows_7.7p1, LibreSSL 2.6.5 tmux 2.6 ``` # Steps to reproduce Open an ssh (other?) session with a running tmux session with default configuration. # Expected behavior tmux session opens as you've left it. # Actual behavior tmux opens with `1;0c` appended to whatever was at the prompt/cursor previously. Applications that consume control characters attempt to do something with them. (I haven't run into any issues with that yet, but it's possible; mostly I'm just in nano, which only complains about `Unknown sequence`). ---------- ## Fix Add a line to `tmux.conf`: `set -s escape-time 10`. Do this on every remote server you log into. I should note that this is not actually an issue with *WT* per say--it also affects cmd.exe (which is what I primarily use for quick, single-command sessions). However, the fix I found was located [here](https://github.com/microsoft/WSL/issues/1638), which links to here as the correct place to file an issue. ## Screenshots <details> <summary>Screenshots</summary> Connecting to my laptop running Ubuntu 18.04.3 via WSL [![Running on my laptop in WSL](https://files.catbox.moe/y7p274.png)](https://files.catbox.moe/y7p274.png) Running on a remote VPS with Ubuntu 18.04.3: [![Running on a remote actual-linux server](https://files.catbox.moe/e247a9.png)](https://files.catbox.moe/e247a9.png) If nano is running, I get a ding and an `Unknown sequence` message: [![Opening a session that has nano running](https://files.catbox.moe/e4xb52.png)](https://files.catbox.moe/e4xb52.png) This one with a running editor has gotten me several times before, as I tend to leave files open, sometimes with modifications to finish later. </details>
claunia added the Needs-TriageNeeds-Tag-FixNeeds-Author-Feedback labels 2026-01-31 02:09:56 +00:00
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Reference: starred/terminal#10006
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