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I am getting the error message “error opening security policy file /usr/X11R6/lib/X11/xserver/SecurityPolicy”. What does that mean ?

April 26, 2017Error file Lib message opening policy security securitypolicy usr X11 X11R6 xserver

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I am getting the error message “error opening security policy file /usr/X11R6/lib/X11/xserver/SecurityPolicy”. What does that mean ?

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The policy file for the SECURITY extension cannot be found. This is not serious unless you want to make use of features of the SECURITY extensions (like treating clients as “untrusted”, e.g. restrict their access to certain Xserver resources). Normally the missing policy file is a problem with your Unix/Linux X11 distribution; consult your vendor where to get the missing file from. Alternatively you can get the plain X11R6.6 security policy file from ftp://ftp.x.org/pub/R6.6/xc/programs/Xserver/Xext/SecurityPolicy (copy it to the matching location – but be sure that you do not overwrite any existing security policy file).