Overview

You see the following error in syslogs: Rx window size violation - SesType 'outside', and you wish to know if it is normal, and what should you do to fix it. 

Solution

The Window size is the number of messages that can be buffered at HUB before sending an ACK to the application. The traffic capacity per application in the HUB is defined as the number of sessions multiplied by the window size. 

Please take the steps below to fix the issue:

1. Login into MGR GUI.
2. Go to SMS Applications ➤ Applications and select the application-facing this issue.
3. Check outside window size value set. The default & Max value is 255.
4. If the value is set to less than 255, please increase the same to 255.
5. If the window size is set to max value 255, but the Rx window size violation is still happening indicating messages are pending, you needs to increase the number of sessions for that Application.

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Additional information for agents:

Root Cause: The “RemPort” is the application port that is connected to the HUB “LocPort”. This trap is generated when the application is sending SMPP submit_sm and exceeding the window size, the error appears in syslogs. App ‘ZTE_VMS_13014” is the application name.

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