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Pasting too many lines into Terminal results in disconnect. Also ssh -L disconnects if I send too many lines of text to server. This does not happen on Putty. #11315

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opened 2026-01-31 02:44:16 +00:00 by claunia · 2 comments
claunia commented 2026-01-31 02:44:16 +00:00
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Originally created by @SebastianDix on GitHub (Nov 8, 2020).

Microsoft Windows [Version 10.0.19041.572]
Windows terminal version 1.3.2651

Any other software?
Chrome, but not necessary to reproduce

Steps to reproduce

in windows terminal open Ubuntu Focal
ssh to remote server
open vim
:set paste
paste ~100 lines of text
observe the remote host disconnecting

OR
connect to remote host and then
just paste any larger (like more than 20 lines of text) code into terminal and try to run it

OR
ssh -L (local port forwarding) from port localhost:1234 on local computer to external host port 5000. Then run an app (I use python Flask development server) on port 5000
then when you access localhost:1234 on local machine, try submitting a lot of text (more than 20 lines) through html form - the local port forwarding will disconnect

Expected behavior

Accept pasting / submitting of multi-line input

Actual behavior

Remote host disconnects (but doesn't from Putty) - wrong Message Authentication Code

When I run port forwarding through putty, or paste multi-line text into putty or do any of the steps in Putty, nothing happens, everything is fine.

Originally created by @SebastianDix on GitHub (Nov 8, 2020). **Microsoft Windows [Version 10.0.19041.572]** Windows terminal version 1.3.2651 Any other software? Chrome, but not necessary to reproduce # Steps to reproduce in windows terminal open Ubuntu Focal ssh to remote server open vim :set paste paste ~100 lines of text observe the remote host disconnecting OR connect to remote host and then just paste any larger (like more than 20 lines of text) code into terminal and try to run it OR ssh -L (local port forwarding) from port localhost:1234 on local computer to external host port 5000. Then run an app (I use python Flask development server) on port 5000 then when you access localhost:1234 on local machine, try submitting a lot of text (more than 20 lines) through html form - the local port forwarding will disconnect # Expected behavior Accept pasting / submitting of multi-line input # Actual behavior Remote host disconnects (but doesn't from Putty) - wrong Message Authentication Code When I run port forwarding through putty, or paste multi-line text into putty or do any of the steps in Putty, nothing happens, everything is fine.
claunia added the Resolution-Duplicate label 2026-01-31 02:44:16 +00:00
claunia commented 2026-01-31 02:44:17 +00:00
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@zadjii-msft commented on GitHub (Nov 8, 2020):

Thanks for the suggestion! This is actually already being tracked by another issue on our repo - please refer to #7601 for more discussion.

/dup #7601

@zadjii-msft commented on GitHub (Nov 8, 2020): Thanks for the suggestion! This is actually already being tracked by another issue on our repo - please refer to #7601 for more discussion. /dup #7601
claunia commented 2026-01-31 02:44:17 +00:00
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@ghost commented on GitHub (Nov 8, 2020):

Hi! We've identified this issue as a duplicate of another one that already exists on this Issue Tracker. This specific instance is being closed in favor of tracking the concern over on the referenced thread. Thanks for your report!

@ghost commented on GitHub (Nov 8, 2020): Hi! We've identified this issue as a duplicate of another one that already exists on this Issue Tracker. This specific instance is being closed in favor of tracking the concern over on the referenced thread. Thanks for your report!
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Reference: starred/terminal#11315
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