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The MS-S4U documentation specifies that hmac-md5 be used for
PA-FOR-USER checksums; we were using the mandatory checksum type for
the key. Although some other checksum types appear to be allowed by
Active Directory KDCs, Richard Silverman reports that md5-des is not
one of them, causing S4U2Self requests to fail for DES keys.
Commit By: ghudson