So we've been having issues with network connection loss at our company with the SQLSTATE = 08S01, or SQLSTATE =08001 error message. We have multiple servers which have applications running on them that client systems connect to and retrieve data from. One of our servers has a Microsoft mySQL Server database running on it. However both the mySQL server and the other server that clients connect to are having network issues. If they get connected to the server straight through a remote desktop connection, they do not experience any network issues, which is odd because they are still connected through the network to the server. Either way, these problems don't happen at a given time, they are completely random, and unexpected. Sometimes we can go a full day without an issue, while other times we can have the issue multiple times within an hour or day.
Server OSs: Windows 2008 R2 64-bit SP1 with all Updates, including the 2775511 enterprise hotfix rollup updated. http:/
Client PCs: Windows 7 64-bit SP1 with all Updates, including the 2775511 enterprise hotfix rollup updated. http:/
Network Hardware we use: Dell PowerConnect 5324 Switch (Main Switch), Cisco sf200-24p Switch ( multiple all around the company), Netgear WNDAP660 AP (Main AP), SonicWall TZ 210 (Main Firewall)
DHCP and DNS location: Main Server hosting the mySQL server
Secondary DNS location: Second server hosting other accounting applications our clients connect to.
Here is what I have tried:
- Disabled Windows Firewall on all systems
- Disabled all Power Saving Features on all the system, including the NIC.
- Checked DHCP configuration, and made sure everything is set up correctly.
- Made sure there are no IP conflicts or odd IP leases.
- Can do nslookup on all systems both with IP, or system name. (However, when the issue happens, the servers are not available, and you cannot even ping them)
- Checked cable connections and replaced all network cables going to the servers and key locations. (Since the whole company is having the issue I am fairly sure it is not all cables, but most likely the cables going to the server hosting the DHCP server that might have a bad cable, either way, that didn't help)
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Tried following and performed all steps in this support article by Microsoft: http:/
/ support.microsoft.com/ kb/ 942861 - All APs, Servers, and Printers have their own static IP address, and only client PCs have DHCP leasing enabled.
- Double checked on DNS configuration, and everything seems to be set up fine. (Hopefully I'm not missing something)
- Checked system resources and we have plenty of resources left, and the network is not overwhelmed with network traffic.
- Replaced the Switch the servers are connected to, but did not fix the issue.
- Connected a few systems straight to the main switch that the servers are connected to, to see if perhaps the other switches we have around the company might be faulty, but the systems connected closest to the server are still experiencing the issues.
- I tried many other things but I can't seem to remember the rest for now.
Any help would be really appreciated. Please let me know if you have additional questions that might help troubleshoot this issue. We've been having this issue for months, and we cannot figure out what might be causing it. Thanks in advance!