Intermittent Connection Resets on ISA 2006 with Broadcom NIC
I recently deployed ISA 2006 on an HP Proliant DL Series Server for one of my clients & tried to publish a whole lots of servers.
For the most part it worked pretty well, at least, until I tried publishing an SMTP Server. I then noticed a strange behaviour: Although I was able to connect to the SMTP Server, the connection was terminated a second or so later & I was never able to successfully establish a productive session.
This lead to much confusion as I had never faced such an issue before when publishing servers. A look into google & the event logs however, did manage to resolve my issue.
It would appear that some Broadcom NICs seem to have an issue with ISA 2006, particularly, with the Recieve Side Scaling setting the NIC. If you turn this feature off in the Network Card Driver Properties and the system seems to function fine.
It is also recommended to turn off TCP Chimney feature of the Scalable Networking Pack which ships with Windows 2003 SP2.
netsh int ip set chimney disabled
For the most part it worked pretty well, at least, until I tried publishing an SMTP Server. I then noticed a strange behaviour: Although I was able to connect to the SMTP Server, the connection was terminated a second or so later & I was never able to successfully establish a productive session.
This lead to much confusion as I had never faced such an issue before when publishing servers. A look into google & the event logs however, did manage to resolve my issue.
It would appear that some Broadcom NICs seem to have an issue with ISA 2006, particularly, with the Recieve Side Scaling setting the NIC. If you turn this feature off in the Network Card Driver Properties and the system seems to function fine.
It is also recommended to turn off TCP Chimney feature of the Scalable Networking Pack which ships with Windows 2003 SP2.
netsh int ip set chimney disabled
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