"map untrusted to domain" does not work with NTLMv2 on RHEL 5 and 6

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Issue

The map untrusted to domain setting should make it unnecessary to specify a valid domain
map untrusted to domain does not work with NTLMv2 on RHEL 5 and 6
NTLMv2 authentication failing for domain members

Environment

Red Hat Enterprise Linux (RHEL) 5.9

samba3x-3.6.6-0.129.el5

Red Hat Enterprise Linux (RHEL) 6.4

samba-3.6.9-151.el6

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