DisableUNCCheck registry key is created during Rational Synergy installation

Technote (FAQ)


Why is the registry key 'HKLM\SOFTWARE\Microsoft\Command Processor\DisableUNCCheck' created during the installation of IBM Rational Synergy client?


When installing Rational Synergy client on Windows the 'HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Command Processor\DisableUNCCheck' registry key is added and set to 'allow'. This enables Uniform Naming Convention(UNC) paths to be used in the command prompt for the current directory. For security or other reasons this may not be wanted.


The registry key:

    ' HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Command Processor\DisableUNCCheck'

with value:
    0x00000001 (1)

is required so that UNC-paths can be used in the Windows command line interface (CLI).
All Rational Synergy processes running through cmd.exe and using UNC paths need this registry key and value. It is therefore not possible to delete this registry key and run Rational Synergy successfully.

Related information

Cmd.exe does not support UNC names

Document information

More support for:

Rational Synergy

Software version:

7.1a, 7.1, 7.2

Operating system(s):


Reference #:


Modified date:


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