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Need some assistance in troubleshooting TCP retransmissions and TCP resets event in a vSphere 5.1 Update 1 environment


I'm currently running having a performance issue reported by the user and I've implemented a dedicated network sniffer appliance (Riverbed Steel Central / Cascade) to detect any packet transmission on my network.

Background: I have deployed a couple of stand alone SQL Server database VMs (4x VMs) to be used by some of the Application Servers VMs (4x stand alone VMs) which is running Oracle Forms (Java) servers. The users are connecting from their own workstation from various geographical locations in Asia Pacific, the Data Center is in Australia.

User (200 users of Windows 7 workstations) --- RDP TCP/3389---> 2x Hardware Load Balancer (Riverbed SteelApp / Stingray) -------> Terminal Server pool VMs (one of 55x available VMs) --- Oracle Form HTTP app TCP/80 -----> Application Server Windows 2008 R2 --- SQL Server TCP/1433---> SQL Server VMs.

Somehow, Network Operations team report that there are some consistent occurrence of TCP retransmit package in between the Application Server to the Database and also between the Terminal Servers.

the occurrence happens in all type of scenario same ESXi host or even different ESXi host


HP BL 465c G7/G8 Blades on c7000 enclosure

HP Virtual Connect modules


vSphere 5.1 U1 for all HP Blades running ESXi and the VCenter server.

All terminal servers (RDSH) and Guest OS: Windows Server 2008 R2 Std. SP1

Database: SQL Server 2005 and 2008 R2

any kind of help and suggestion would be greatly appreciated.


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2 Replies
Hot Shot
Hot Shot

Did you ever get this fixed? We are fighting the same issue.


Hi wreedMH‌ I also wonder if your environment is the same as mine here:

HP Blade c7000 enclosure, HP Blade BL 466c G7 & G8 (last firmware update 2013) running VMware ESXi 5.1 Update 1 (before the fix).

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