Morning all, I’m trying to solve a rather annoying issue with two of our TMG servers (virtualised on ESXi).
It started with the VPN connections for uploads being very slow. After more testing, I found that it affected all traffic that was uploading!
We have a 50 up, 50 down internet connection.
Both TMGs are less than a month old, and were installed with all updates before they were used/configured.
Background testing & notes
- Our old physical ISA box doesn’t have the fault - This takes internal switching and internet connection problems out of the equation.
- The issue appears on both of our TMG servers.
- Doing a file transfer to/from each TMG server to machines in the local LAN doesnt show there to be a problem with that, with speeds hitting 80-100MB/s - this takes a problem with the virtual hosts nic/MTU setup out of the equation.
Steps tried:
- EnablePMTUDiscovery has been tried as on (but not off yet).
- The knowledge base article listed here: http://support.microsoft.com/kb/2452980 has been applied to the SP2 w/Update 2 boxes.
- One of the TMGs has had all patches and updates removed all the way back to SP1 Update 1, and then re-applied in order, with SP1 Update 2 having the reg keys and script ran before testing, then further upgrades to the latest.
Notes:
The registry keys, at any point and patch level don’t exist, nor do the DWORD values.
So what I have done is to create under the registry key location:
HKLM\System\CurrentControlSet\Services\W3Proxy is the following:
A key called “Paramaters”
And created the 32bit DWORD Values with 16 in hexadecimal
.\W3Proxy\
.\W3Proxy\Parameters\
.\W3Proxy\Performance\
.\W3Proxy\Performance\Parameters\
The script to modify the TCP Buffer was set to use a value of 60,000.
The issue has been logged with Partner Support Services, but they only operate Monday to Friday, and I was hoping to make some progress on this over this weekend.
Any help would be much appreciated.
Thanks in advance all.