Hi,
Based on your description, I know that you are getting the issue above when using the LoadGen tool. Since this is Exchange server forum and we mainly discuss evaluation, troubleshooting, tools, documentation or other general issues on Exchange server,
while your issue is more related to the LoadGen tool. To better resolve the issue, we suggest you contact LoadGen.
Thanks for your understandings!
Regards,
Manu Meng
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