# Unsure of error message.

**URL:** https://community.cambiumnetworks.com/t/unsure-of-error-message/46441
**Category:** ePMP
**Created:** [July 15, 2016, 2:51pm UTC](https://community.cambiumnetworks.com/t/unsure-of-error-message/46441 "2016-07-15T14:51:28Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![Fedor](https://d10gw3vjmzyp8.cloudfront.net/user_avatar/community.cambiumnetworks.com/fedor/32/20305_2.png) [@Fedor](https://community.cambiumnetworks.com/u/Fedor)
#### Post date: [July 18, 2016, 7:35am UTC](https://community.cambiumnetworks.com/t/unsure-of-error-message/46441/2 "2016-07-18T07:35:20Z")

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Hi LothianB,

Error message indicates that packet with bad MTU size is detected and cannot be handled.

Please check your MTU setting on SM and Devices which are interacting with it.

It is not related to SM's disassociation events.

Please enable and then check System log on AP and SM whether disassociation reasons was written.

Please find list of reasons in Knowledge Base:

[http://community.cambiumnetworks.com/t5/ePMP-Troubleshooting/Network-Entry-State-Definitions-and-Courses-of-Action/m-p/40712#U40712](https://community.cambiumnetworks.com/t/network-entry-state-definitions-and-courses-of-action/40551)

Thank you.

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