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What is SessMsg?

I am monitoring network bandwidth for my company. There is a lot of traffic between two servers and under the Protocols its showing as NetBIOS traffic, specifically SessMsg. I can't find any information on what type of data the SessMsg protocol would be. Can anyone enlighten me?

Thank you.
Sandra
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SKpollyanna
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SKpollyanna
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
The displayed data depends on the monitoring app. From the infos you gave I would guess it is session management protocol, a part of SMB which is used to keep current NetBIOS session info.

Each computer using NetBIOS to communicate with another NetBIOS-enabled computer has to login and use a session, which holds the login data. After this, the session info can be used to transfer data.

SMB / NetBIOS are very chatty protocols. Computers talk all the time, even if no file shares are used at the moment.
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SKpollyannaIT ManagerAuthor Commented:
The application I'm using is Ehterpeek, an older version of OmniPeek. I am unable to locate anything on their site. The SessMsg is a sub-category of the NetBIOS protocol listing. THe two systems are communicating across our VPN using 1500 kbits of bandwidth, or 50% of our available bandwidth. So basically it is likely just data being sent?

Thank you.
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
A NB SessMsg is 64 bytes. That should not fill up half of your bandwidth, that's quite unusual. I suppose you messured all NetBIOS messages - if the systems are exchanging files (or only checking for existence or alike) a lot, those transfer amounts could be reached.
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