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Malformed packet LBMSRS_2

asked 2021-09-20 07:38:12 +0000

Piltti gravatar image


I am using Wireshark to take a csv log from server, listening UDP or TCP port. NBIoT device is sending messages in hex format to server. Messages look like “Message 1”. Server is answering "Answer 1". In case of UDP sending and reciving, messages are decoded and everithing is OK. In case of TCP. Messages sent to server are nor decoded. TCP payload is visible in hex, but it can not be decode. It is written "Malformed packet LBMSRS". This started after upgrade. I am using Version 3.4.8

How can I correct this to get decoded “Message 1”

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answered 2021-09-20 13:01:23 +0000

grahamb gravatar image

LBMSRS is a heuristic tcp dissector so may be picking up your traffic by mistake. You can disable the protocol by right-clicking the protocol in the packet details list and choosing Protocol Preferences -> Disable LBMSRS or from Analyze -> Enabled Protocols... and entering LBMSRS in the search box and unchecking it's entry in the list.

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first option ...Protocol Preferences was alowed to Disable LBMSRS. Second option... Analyze.. Enable Protocols..Uncheck box LBMSRS did the job.


Piltti gravatar imagePiltti ( 2021-09-21 10:27:35 +0000 )edit

If an answer has solved your issue, then please "accept" it by clicking the checkmark icon to the left of the answer so that others with the same\similar question may know what helped.

grahamb gravatar imagegrahamb ( 2021-09-21 10:50:27 +0000 )edit

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Asked: 2021-09-20 07:38:12 +0000

Seen: 1,388 times

Last updated: Sep 21 '21