It turns out in my case, this was related to the TFTP block size. In 9.6, it was apparently fixed at 1456, and in 2017.3 it is variable. However, it does not start out at the most compatible size, it starts out at the largest size. I had changed it previously, but when it didn't appear to work, I changed it back. It didn't work because I had to either A) wait for the polling interval for the reps to update, or B) restart the LANDesk Targeted Multicast service, and then try it.
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