Need help with intermittent Network connectivity issues
I have been experiencing intermittent network connectivity issues between my Windows 7 Ultimate machine and a Small Business Server 2008 machine. This is a new problem. Several line of business applications either give database connectivity errors or lock up entirely. I was looking to blame one LOB app in particular because it was recently upgraded, however, I have also noticed a problem in general windows. Most notably, I receive errors for offline folders during sync: "An unexpected network error occurred." We have many shared folders on the server that I sync to my local machine so that they are indexed. To me, this points to either a problem with the server, the client, or the network. Have tried the following without success: 1. Turned off IP offload on both client and server. 2. I have turned off jumbo frames on both client and server. 3. I have reduced the link speed on the network from 1Gb to 100Mb. 4. I have tried pinging the server with varying size packets. Most respond <1ms. However, rvery once in a while, I get packets that take 3 and 4ms. I have no idea what else I can do to troubleshoot, but I am pulling my hair out. Any assistance is appreciated.
March 22nd, 2010 4:02pm

Hi, May I know how other computers works? Does some other Windows 7 client encounter this issue? Based on my research, I would like to suggest the following: 1. Update the NIC driver. 2. Enable NetBIOS over TCP/IP in Windows 7: a) Go to “Control Panel\Network and Internet\Network Connections”. b) Right-Click on the connection and choose Properties. c) Click “Internet Protocol (TCP/IP) Version 4” in the list. d) Click Properties, and then click Advanced. e) On the Advanced TCP/IP settings windows, go to “WINS” tab. f) Under NetBIOS setting, click “Enable NetBIOS over TCP/IP”, and then click OK. 3. On the Windows 7 computer, run the following command in an elevated command prompt to disable Windows Firewall and check the issue: Netsh advfirewall set allprofiles state off Note: you can turn back on with the command “Netsh advfirewall set allprofiles state on”. Hope this helps. Thanks. Nicholas Li - MSFT
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March 25th, 2010 11:35am

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