When you try to boot more than 200 computers at the same time via PXE, on some client machines the following error will be reported:
Error "PXE-T09 No more transfers available"
PXE-T09 No more transfers available
In DS 7.1 the default value of concurrent MTFTP downloads is set to 200 dynamic slots.
This value is hard-coded and cannot be changed.
Our development is aware of the problem. Currently there is no ETA for a FIX.
As a workaround use OpenTFTP. To install OpenTFTP follow the instructions from the article HOWTO26127