NTLM APS process takes around 98% (!) of CPU time under Ret Hat Enterprise Linux 4 when cooperate with MS ISA Server parent proxy. When it cooperated with old MS Proxy 2.0 everything was ok !
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Thank you for your problem report.
It is possible that your problem has been fixed on the latest Subversion copy of ntlmaps, but has not yet been included in a formal release. Please download a snapshot of the trunk to try out the package now, and report back any problems.