8u20 nightly bundles are named as "8" not "8u20" as a result short names links are invalid and bundles could not be found:
for ex:
/net/backpack.us.oracle.com/jdp-scratch/deployment/ds_build/1.8.0_20/nightly/2014-03-29_01-31-16/solaris-sparcv9/jdk-8-ea-bin-b124-solaris-sparcv9-29_mar_2014.tar.gz - should be 8u20, not 8:

/net/backpack.us.oracle.com/jdp-scratch/deployment/ds_build/1.8.0_20/nightly/2014-03-29_01-31-16/solaris-sparcv9/jdk-8u20-ea-solaris-sparcv9.tar.gz -> jdk-8u20-*-solaris-sparcv9-??_???_????.tar.gz

linux bundles:
/net/backpack.us.oracle.com/jdp-scratch/deployment/ds_build/1.8.0_20/nightly/2014-03-29_01-31-16/linux-i586/jdk-8u20-ea-linux-i586.tar.gz -> jdk-8u20-*-linux-i586-??_???_????.tar.gz