Summary
The remote host is missing an update to the system as announced in the referenced advisory.
Solution
Update your system with the appropriate patches or software upgrades.
http://lists.dlitz.net/pipermail/pycrypto/2009q1/000062.html http://www.vuxml.org/freebsd/5a021595-fba9-11dd-86f3-0030843d3802.html
Insight
The following package is affected: py-pycrypto