For the second day running, the number of fans wanting trying to book for the home leg against Carlisle caused the system to crash.
"Demand like this has never been experienced by them before, including their clients Liverpool, Newcastle and Rangers," said a club spokesman.
"Improvements are being made. However, in an attempt to reduce the fustration of our fans this service will be withdrawn."
The Elland Road club say tickets are now limited but remain available at the ticket office counters or by calling 0871 334 1992.
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