Kudu PowerShell throwing: Window title cannot be longer than 1023 characters

Nico 0 Reputation points
2026-09-10T21:48:10.24+00:00

Kudu PowerShell randomly throws an error:

Window title cannot be longer than 1023 characters

This appears similar to the historical Kudu GitHub issue #2635, which was closed when the Kudu repo was archived, but the behavior is still reproducible.

Steps to Reproduce

  1. Open a Kudu PowerShell session
  2. Commands vary, but here are two examples on which it triggered:
       PS C:\home> tcpping ubuntu-serve.net.local:3306; echo test
       Connected to ubuntu-serve.net.local:3306, time taken: 489ms
       Connected to ubuntu-serve.net.local:3306, time taken: 530ms
       Connected to ubuntu-serve.net.local:3306, time taken: 80ms
       Connected to ubuntu-serve.net.local:3306, time taken: 170ms
       Complete: 4/4 successful attempts (100%). Average success time: 317.25ms
       Window title cannot be longer than 1023 characters.
       At line:1 char:1
       + tcpping ubuntu-serve.net.local:3306; echo test
       + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
           + CategoryInfo          : InvalidArgument: (:) [], RuntimeException
           + FullyQualifiedErrorId : Argument
        
       test
    
       PS C:\home> exit
       exit
       
       process [2556] terminated!  Press ENTER to start a new cmd process.
       
       PS C:\home> git --version
       git --version
       git version 2.46.0.windows.1
       PS C:\home> git --version
       git --version
       git version 2.46.0.windows.1
       Window title cannot be longer than 1023 characters.
       PS C:\home> 
       At line:1 char:1
       + git --version
       + ~~~~~~~~~~~~~
          + CategoryInfo          : InvalidArgument: (:) [], RuntimeException
          + FullyQualifiedErrorId : Argument
    
    
       PS C:\home> git --version
       git --version
       git version 2.46.0.windows.1
       Window title cannot be longer than 1023 characters.
       PS C:\home> At line:1 char:1
       + git --version
       + ~~~~~~~~~~~~~
          + CategoryInfo          : InvalidArgument: (:) [], RuntimeException
          + FullyQualifiedErrorId : Argument
    
       git --version
       git --version
       git version 2.46.0.windows.1
       Window title cannot be longer than 1023 characters.
       PS C:\home> At line:1 char:1
       + git --version
       + ~~~~~~~~~~~~~
          + CategoryInfo          : InvalidArgument: (:) [], RuntimeException
          + FullyQualifiedErrorId : Argument
    
       git --version
       git --version
       git version 2.46.0.windows.1
       PS C:\home> 
    

Environment

  • Azure App Service (Windows)
  • VNet Integration enabled
  • Region: West US 3
  • App Service Plan SKU: Basic
  • Site architecture: 32-bit (x86)
  • Kudu version: 2026.08.1.2?
  • PowerShell version: 5.1.20348.5499
  • Git version: 2.46.0.windows.1

Observations

  • The issue is intermittent and cannot be reproduced on every execution: the same command may trigger the exception several times in a row and then later succeed without issue.
  • The exception is emitted after the command completes (though sometimes the output is interleaved).
  • The exception does not kill the process: subsequent commands continue to execute normally (echo test still executes).
  • The same behavior occurs for several different commands: the original GitHub issue mentions git --version causing the issue, but I can also reproduce it with tcpping.
  • This suggests the issue is related to the Kudu PowerShell host rather than the command being executed.

Questions

  1. Is this a known issue in the current Azure App Service Kudu environment?
  2. Was the issue ever fixed, or was it closed as part of the Kudu repository archival process?
  3. Is there a supported workaround for the Kudu PowerShell console when this exception occurs?
  4. Is there a replacement channel for reporting Kudu defects now that the GitHub repository is archived and Basic support plans cannot open technical support incidents?
  5. Can anyone provide any additional information on this issue?
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