This is a very weird server network problem. Please help me with it.

Recently, our server encountered some strange network problems,OccasionallyThe traffic is very low, for example:

In this case, some access failures occur on the client (I tested with my colleagues at the same time: Sometimes I was not allowed to access the client, and sometimes I was not allowed to access the client.

Approximate5-10 secondsIt will be restored immediately after the clock.In this case, the CPU and memory usage are normal, and the CPU cannot exceed 10%..

In the middle, we change to a new NIC (the server has two identical NICs, and the driver is the same, this problem still occurs when we change to a new IP address (to change the switch.

In order to test the problem, we wrote a page, which can be automatically refreshed Based on the specified time, such as 1 second and 2 seconds. The page is accessed at the same time in the browser of the client and the browser of the server,

We useGuidAnd save it to the database.

I used three browsers to test: chrome and IE use connection: keep-alive connection, Firefox use connection: Close HTTP header.

When the traffic is low, there is no problem with chrome and IE, and Firefox will be inaccessible.

When Firefox fails to be accessed, we cannot find the guid in the IIS log or in the database.The request is not forwarded to IIS.

I have disabled comodo and MSE, but problems still occur. Prove not a firewall Problem Ping the gateway is also normal. It is also normal to ping the server locally. I visited three websites at the same time: www.sojump.com, www.sojiang.com, blog.sojump.com, and test.sojump.com in the same IIS. Program Pool. Blog.sojump.com uses the open-source blogengine.net, and test.sojump.com has only one test Static Page . Four websites may encounter problems at the same time when traffic is low. It proves that it has little to do with the program and ASP. NET. We used Microsoft's network monitor to capture packets. We didn't catch the URL when the access went wrong. Other packets were captured.

The intermediate IDC room has told us:

In the past, a customer experienced a similar situation. They used M of dedicated bandwidth. When the network traffic was very high, the traffic would suddenly fall below 5 m in a few seconds, then they updated the NIC Driver and recovered.

Our situation is a little different. When our traffic drops to a very low level, the network traffic did not reach a very high peak. Sometimes this problem does not occur when the network traffic remains at the highest peak.

Our network card is intel, and the network card driver is Microsoft's own driver. We do not dare to update the network card driver because updating the network card driver may affect access to the entire website, do you know if you have encountered a similar problem before?

Server Configuration: Windows 2008 R2 Standard

In IIS 7.5

SQL Server 2008 Enterprise

Comodo firewall and Microsoft MSE antivirus software installed

Intel Xeon e5620 2 24 GB memory

Network AdapterIntel (r) 82574l gigabit network connection

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