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[ScreenOS] Unable to telnet\SSH to firewall due to the 'Can't create telnet\ssh-cmd:6 task' error on the console

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Article ID: KB24374 KB Last Updated: 28 May 2012Version: 1.0
Summary:
This article describes the issue of being unable to access the firewall via SSH or Telnet. However, console access is working.
Symptoms:
Access to the firewall via SSH and Telnet is failing and the following errors are generated on the console:

  • For Telnet: Can't create telnet-cmd:6 task

  • For SSH: Can't create ssh-cmd:140 task
Cause:
  • This is due to the maximum number of allowed tasks being reached on the device.

  • SSGs can support up to a maximum of 112 tasks (0-111). This limit was applicable for releases below 6.2r5, 6.3r2, and 5.4r16.

  • So, if the above errors are generated, you can check the number of tasks being used by executing the get os task command.


Solution:
The number of tasks required by ScreenOS was increased with time; however, the number of tasks supported was not increased for SSG platforms. Specifically, the number of tasks required for the TASK AV WORKER was increased. So, as a workaround, the AV license can be removed, which will free up a lot of tasks.

As a permanent fix, the task limit was increased to 144 in SSG devices and the following releases contain the fix:

  • 6.3r2 and above

  • 6.2r5 and above

  • 5.4r16 and above
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