cvsup "Premature EOF" error

[Bnonn]

Hello again everyone.

Another "problem"; nothing really that's an issue, but something I'm
curious if anyone knows the cause of.

When running csvup to cvsup.nz.freebsd.org, I get the following error
the first time I run cvsup (full command I'm using is <cvsup -L
2 /root/scarlet.cvs>):

	Premature EOF from server. Will retry at <CURRENT_TIME + 5 MIN>

Anyone know why I might be getting this? Canceling the five minute wait
and rerunning cvsup immediately afterward works fine.