[This was found while debugging why SELinux "sandbox -X" doesn't work on my machine] kernel-2.6.35.4-12.fc14.i686 xorg-x11-server-Xephyr-1.9.0-4.fc14.i686 1. disable IPv6 module loading Either add a file to /etc/modprobe.d with install ipv6 /bin/true or blacklist ipv6 + disable all services that might set up ipv6, e.g. ip6tables 2. after boot make sure that "ipv6" isn't loaded: # lsmod | fgrep ipv6 # 3. SELinux can be in Enforced or Permissive mode This only affects what kind of AVCs you'll receive. It hasn't anything to do with the problem. 4. start Xephyr (this is the command line used by sandbox -X) $ /usr/bin/Xephyr -title "test" -terminate -screen 1024x768 -displayfd 5 _XSERVTransSocketOpenCOTSServer: Unable to open socket for inet6 _XSERVTransOpen: transport open failed for inet6/l3f1199:0 _XSERVTransMakeAllCOTSServerListeners: failed to open listener for inet6 _XSERVTransSocketUNIXCreateListener: ...SocketCreateListener() failed _XSERVTransMakeAllCOTSServerListeners: server already running _XSERVTransSocketOpenCOTSServer: Unable to open socket for inet6 _XSERVTransOpen: transport open failed for inet6/l3f1199:1 _XSERVTransMakeAllCOTSServerListeners: failed to open listener for inet6 _XSERVTransSocketOpenCOTSServer: Unable to open socket for inet6 _XSERVTransOpen: transport open failed for inet6/l3f1199:2 ... ... and so on and so on ... ... _XSERVTransMakeAllCOTSServerListeners: failed to open listener for inet _XSERVTransSocketOpenCOTSServer: Unable to open socket for local _XSERVTransOpen: transport open failed for local/l3f1199:64510 _XSERVTransMakeAllCOTSServerListeners: failed to open listener for local _XSERVTransSocketOpenCOTSServer: Unable to open socket for unix _XSERVTransOpen: transport open failed for unix/l3f1199:64510 _XSERVTransMakeAllCOTSServerListeners: failed to open listener for unix Fatal server error: Failed to find a socket to listen on
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