FIPS Mode Not Supported in Some 12.x Versions
FIPS mode is supported with 12.5(1)SU1. However, FIPS mode is not supported with Releases 12.0(x) and 12.5(1) of Cisco Unified Communications Manager and the IM and Presence Service. If you are upgrading from an earlier release with FIPS mode, Enhanced Security Mode, or Common Criteria Mode enabled, you must disable them prior to the upgrade to these releases, or upgrade to 12.5(1)SU1 instead. TFTP and other services will not work in 12.0(x) or 12.5(1) with FIPS mode enabled.