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High network activity on NetBios-SSN device

High network activity on NetBios-SSN device

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MatthewRyan67
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03-01-2016, 10:45 PM
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Hi everyone, I'm facing a tricky issue at work that's really confusing me. I'm unsure if this fits the right context or location for discussion. Let me try to convey my situation clearly. In our organization, we use two File Servers (SLES) and Windows 10 clients (version 1607) with Novell Clients installed (OES 2 SP4 IR4). These Novell clients connect to one of the file servers via network drives. On the server side, we run a custom application that launches from an .exe file stored on a network drive. About two months ago, when this app started, client performance dropped significantly. Although CPU and RAM usage were only slightly elevated, the system felt sluggish. The servers also have SSDs installed. I opened Process Explorer to investigate the cause. There was minimal CPU activity (roughly 10-20%). Then I used Process Monitor and saw a massive amount of NetBios-ssn traffic going to the file server—about 50 times per second. Since the system can't terminate this process, I disabled the network adapter temporarily. Performance returned to normal once it was back online. When I restarted the application, the same issue occurred again. The app seems to be just for logging work hours. I checked Process Explorer to find the problematic thread but couldn't get a detailed view of the system processes. I shared the thread overview here. Now I'm really stuck and don't know where to focus next... Could it be related to the Windows OS, network card/driver, Novell client, or the file server? Thanks for your help! Mike
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MatthewRyan67
03-01-2016, 10:45 PM #1

Hi everyone, I'm facing a tricky issue at work that's really confusing me. I'm unsure if this fits the right context or location for discussion. Let me try to convey my situation clearly. In our organization, we use two File Servers (SLES) and Windows 10 clients (version 1607) with Novell Clients installed (OES 2 SP4 IR4). These Novell clients connect to one of the file servers via network drives. On the server side, we run a custom application that launches from an .exe file stored on a network drive. About two months ago, when this app started, client performance dropped significantly. Although CPU and RAM usage were only slightly elevated, the system felt sluggish. The servers also have SSDs installed. I opened Process Explorer to investigate the cause. There was minimal CPU activity (roughly 10-20%). Then I used Process Monitor and saw a massive amount of NetBios-ssn traffic going to the file server—about 50 times per second. Since the system can't terminate this process, I disabled the network adapter temporarily. Performance returned to normal once it was back online. When I restarted the application, the same issue occurred again. The app seems to be just for logging work hours. I checked Process Explorer to find the problematic thread but couldn't get a detailed view of the system processes. I shared the thread overview here. Now I'm really stuck and don't know where to focus next... Could it be related to the Windows OS, network card/driver, Novell client, or the file server? Thanks for your help! Mike

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