I've used Httrack to copy websites from here before, and now it suddenly
stopped working. I used 1 connection limit, and everything else is default,
and it worked fine. When I used no connection limit, it used to get .delayed
files. However, now I can't even get 1 pdf. The server is probably restricting
bandwidth or something.

log file:
HTTrack3.48-19+htsswf+htsjava launched on Tue, 02 Dec 2014 00:55:29 at
<http://isites.harvard.edu/icb/icb.do?keyword=k8248>
<http://isites.harvard.edu/icb/icb.do?keyword=k20062&pageid=icb.page99073> -*
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+http://isites.harvard.edu/fs/docs/*/*.pdf
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(winhttrack -WC2%Ps2u1%s%uN0%I0p3DaK0c1H0%k0f2A25000%f#f -F "Mozilla/4.5
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HTTrack Website Copier/3.x [XR&CO'2014], %s -->" -%l "en, *"
<http://isites.harvard.edu/icb/icb.do?keyword=k8248>
<http://isites.harvard.edu/icb/icb.do?keyword=k20062&pageid=icb.page99073> -O1
"C:\Users\My\Downloads\Physics\math\Harvard\math 25a assorted\math 25a
assorted" -* +http://isites.harvard.edu/icb/*.html
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+http://www.math.harvard.edu/*/*/*/*/*.tex -mime:*/* +mime:text/html
+mime:image/* )
Information, Warnings and Errors reported for this mirror:
note: the hts-log.txt file, and hts-cache folder, may contain sensitive
information,
 such as username/password authentication for websites mirrored in this
project
 do not share these files/folders if you want these information to remain
private
HTTrack Website Copier/3.48-19 mirror complete in 4 seconds : 3 links scanned,
2 files written (23016 bytes overall) [7938 bytes received at 1984 bytes/sec],
23533 bytes transferred using HTTP compression in 3 files, ratio 28%
(No errors, 0 warnings, 0 messages)