Holas:
Bueno, tienes un error bastante feo entre manos*
Es raro, es como si se generase un error irrecuparable al procesar uno
de los aarchivos d econfiguracion
/etc/sysconfig/network-scripts/ifcfg-Auto_Shadow
Prueba moviendo ese archivo a otra ubicacion y trata de reiniciar el
servicio nuevamente.

Ahora bien, de todas formas debes reportar esto
(http://fedoraproject.org/wiki/Bugzilla)

Suerte!

* La parte interesante del error
May 29 18:06:14 lorsyatenea NetworkManager[2462]: <info>
NetworkManager (version 0.8.999-3.git20110526.fc15) is starting...
May 29 18:06:14 lorsyatenea NetworkManager[2462]: <info> Read config
file /etc/NetworkManager/NetworkManager.conf
May 29 18:06:14 lorsyatenea NetworkManager[2462]: <info> VPN: loaded
org.freedesktop.NetworkManager.pptp
May 29 18:06:14 lorsyatenea NetworkManager[2462]: <info> VPN: loaded
org.freedesktop.NetworkManager.openvpn
May 29 18:06:14 lorsyatenea NetworkManager[2462]: <info> VPN: loaded
org.freedesktop.NetworkManager.vpnc
May 29 18:06:14 lorsyatenea NetworkManager[2462]: <info> VPN: loaded
org.freedesktop.NetworkManager.openconnect
May 29 18:06:14 lorsyatenea NetworkManager[2462]:    ifcfg-rh:
Acquired D-Bus service com.redhat.ifcfgrh1
May 29 18:06:14 lorsyatenea NetworkManager[2462]: <info> Loaded plugin
ifcfg-rh: (c) 2007 - 2010 Red Hat, Inc.  To report bugs please use the
NetworkManager mailing list.
May 29 18:06:14 lorsyatenea NetworkManager[2462]: <info> Loaded plugin
keyfile: (c) 2007 - 2010 Red Hat, Inc.  To report bugs please use the
NetworkManager mailing list.
May 29 18:06:14 lorsyatenea NetworkManager[2462]:    ifcfg-rh: parsing
/etc/sysconfig/network-scripts/ifcfg-eth0 ...
May 29 18:06:14 lorsyatenea NetworkManager[2462]:    ifcfg-rh:
read connection 'System eth0'
May 29 18:06:14 lorsyatenea NetworkManager[2462]:    ifcfg-rh: parsing
/etc/sysconfig/network-scripts/ifcfg-lo ...
May 29 18:06:14 lorsyatenea NetworkManager[2462]:    ifcfg-rh: parsing
/etc/sysconfig/network-scripts/ifcfg-Auto_LabRedes ...
May 29 18:06:14 lorsyatenea NetworkManager[2462]:    ifcfg-rh:
read connection 'Auto LabRedes'
May 29 18:06:14 lorsyatenea NetworkManager[2462]:    ifcfg-rh: parsing
/etc/sysconfig/network-scripts/ifcfg-Auto_HP4E5D45 ...
May 29 18:06:14 lorsyatenea NetworkManager[2462]:    ifcfg-rh:
read connection 'Auto HP4E5D45'
May 29 18:06:14 lorsyatenea NetworkManager[2462]:    ifcfg-rh: parsing
/etc/sysconfig/network-scripts/ifcfg-Auto_Estudiante_Utb ...
May 29 18:06:14 lorsyatenea NetworkManager[2462]:    ifcfg-rh:
read connection 'Auto Estudiante_Utb'
May 29 18:06:14 lorsyatenea NetworkManager[2462]:    ifcfg-rh: parsing
/etc/sysconfig/network-scripts/ifcfg-Auto_CANDANOZA ...
May 29 18:06:14 lorsyatenea NetworkManager[2462]:    ifcfg-rh:
read connection 'Auto CANDANOZA'
May 29 18:06:14 lorsyatenea NetworkManager[2462]:    ifcfg-rh: parsing
/etc/sysconfig/network-scripts/ifcfg-Auto_Shadow ...
May 29 18:06:14 lorsyatenea NetworkManager[2462]: <warn> caught signal
11. Generating backtrace...
May 29 18:06:14 lorsyatenea NetworkManager: ******************* START
**********************************
May 29 18:06:14 lorsyatenea NetworkManager: [Thread debugging using
libthread_db enabled]
May 29 18:06:14 lorsyatenea NetworkManager: 0x00769416 in __kernel_vsyscall ()
May 29 18:06:14 lorsyatenea NetworkManager: #0  0x00769416 in
__kernel_vsyscall ()
May 29 18:06:14 lorsyatenea NetworkManager: #1  0x410185a3 in
__waitpid_nocancel () from /lib/libpthread.so.0
May 29 18:06:14 lorsyatenea NetworkManager: #2  0x080a4b65 in
nm_logging_backtrace ()
May 29 18:06:14 lorsyatenea NetworkManager: #3  0x0808a21d in ?? ()
May 29 18:06:14 lorsyatenea NetworkManager: #4  <signal handler called>
May 29 18:06:14 lorsyatenea NetworkManager: #5  0x410ee0d2 in
g_hash_table_iter_next () from /lib/libglib-2.0.so.0
May 29 18:06:14 lorsyatenea NetworkManager: #6  0x080d3340 in ?? ()
May 29 18:06:14 lorsyatenea NetworkManager: #7  0x080d4fd1 in
nm_settings_connection_replace_settings ()
May 29 18:06:14 lorsyatenea NetworkManager: #8  0x00e42a67 in
nm_ifcfg_connection_new () from
/usr/lib/NetworkManager/libnm-settings-plugin-ifcfg-rh.so
May 29 18:06:14 lorsyatenea NetworkManager: #9  0x00e40f14 in ?? ()
from /usr/lib/NetworkManager/libnm-settings-plugin-ifcfg-rh.so
May 29 18:06:14 lorsyatenea NetworkManager: #10 0x00e4157e in ?? ()
from /usr/lib/NetworkManager/libnm-settings-plugin-ifcfg-rh.so
May 29 18:06:14 lorsyatenea NetworkManager: #11 0x00e41796 in ?? ()
from /usr/lib/NetworkManager/libnm-settings-plugin-ifcfg-rh.so
May 29 18:06:14 lorsyatenea NetworkManager: #12 0x080d2e50 in
nm_system_config_interface_get_unmanaged_specs ()
May 29 18:06:14 lorsyatenea NetworkManager: #13 0x080cf470 in ?? ()
May 29 18:06:14 lorsyatenea NetworkManager: #14 0x080d2158 in nm_settings_new ()
May 29 18:06:14 lorsyatenea NetworkManager: #15 0x08060e14 in main ()
May 29 18:06:14 lorsyatenea NetworkManager:
May 29 18:06:14 lorsyatenea NetworkManager: Thread 1 (Thread
0xb78a0750 (LWP 2462)):
May 29 18:06:14 lorsyatenea NetworkManager: #0  0x00769416 in
__kernel_vsyscall ()
May 29 18:06:14 lorsyatenea NetworkManager: No symbol table info available.
May 29 18:06:14 lorsyatenea NetworkManager: #1  0x410185a3 in
__waitpid_nocancel () from /lib/libpthread.so.0
May 29 18:06:14 lorsyatenea NetworkManager: No symbol table info available.
May 29 18:06:14 lorsyatenea NetworkManager: #2  0x080a4b65 in
nm_logging_backtrace ()
May 29 18:06:14 lorsyatenea NetworkManager: No symbol table info available.
May 29 18:06:14 lorsyatenea NetworkManager: #3  0x0808a21d in ?? ()
May 29 18:06:14 lorsyatenea NetworkManager: ble.
May 29 18:06:14 lorsyatenea NetworkManager: #4  <signal handler called>
May 29 18:06:14 lorsyatenea NetworkManager: No symbol table info available.
May 29 18:06:14 lorsyatenea NetworkManager: #5  0x410ee0d2 in
g_hash_table_iter_next () from /lib/libglib-2.0.so.0
May 29 18:06:14 lorsyatenea NetworkManager: No symbol table info available.
May 29 18:06:14 lorsyatenea NetworkManager: #6  0x080d3340 in ?? ()
May 29 18:06:14 lorsyatenea NetworkManager: No symbol table info available.
May 29 18:06:14 lorsyatenea NetworkManager: onnection_replace_settings ()
May 29 18:06:14 lorsyatenea NetworkManager: No symbol table info available.
May 29 18:06:14 lorsyatenea NetworkManager: #8  0x00e42a67 in
nm_ifcfg_connection_new () from
/usr/lib/NetworkManager/libnm-settings-plugin-ifcfg-rh.so
May 29 18:06:14 lorsyatenea NetworkManager: No symbol table info available.
May 29 18:06:14 lorsyatenea NetworkManager: libnm-settings-plugin-ifcfg-rh.so
May 29 18:06:14 lorsyatenea NetworkManager: No symbol table info available.
May 29 18:06:14 lorsyatenea NetworkManager: #10 0x00e4157e in ?? ()
from /usr/lib/NetworkManager/libnm-settings-plugin-ifcfg-rh.so
May 29 18:06:14 lorsyatenea NetworkManager: No symbol table info available.
May 29 18:06:14 lorsyatenea NetworkManager: ugin-ifcfg-rh.so
May 29 18:06:14 lorsyatenea NetworkManager: No symbol table info available.
May 29 18:06:14 lorsyatenea NetworkManager: #12 0x080d2e50 in
nm_system_config_interface_get_unmanaged_specs ()
May 29 18:06:14 lorsyatenea NetworkManager: No symbol table info available.
May 29 18:06:14 lorsyatenea NetworkManager: #13 0x080cf470 in ?? ()
May 29 18:06:14 lorsyatenea NetworkManager: No symbol table info available.
May 29 18:06:14 lorsyatenea NetworkManager: #14 0x080d2158 in nm_settings_new ()
May 29 18:06:14 lorsyatenea NetworkManager: le info available.
May 29 18:06:14 lorsyatenea NetworkManager: #15 0x08060e14 in main ()
May 29 18:06:14 lorsyatenea NetworkManager: No symbol table info available.
May 29 18:06:14 lorsyatenea NetworkManager: A debugging session is active.
May 29 18:06:14 lorsyatenea NetworkManager:
May 29 18:06:14 lorsyatenea NetworkManager: #011Inferior 1 [process
2462] will be detached.
May 29 18:06:14 lorsyatenea NetworkManager:
May 29 18:06:14 lorsyatenea NetworkManager: Quit anyway? (y or n)
[answered Y; input not from terminal]
May 29 18:06:14 lorsyatenea NetworkManager: ******************* END
**********************************
May 29 18:06:14 lorsyatenea systemd[1]: NetworkManager.service: main
process exited, code=exited, status=1
May 29 18:06:14 lorsyatenea systemd[1]: Unit NetworkManager.service
entered failed state.


2011/5/30 lorsyatenea <[email protected]>:
> nuevamente...
>
> El 29 de mayo de 2011 23:05, Carlos (casep) Sepulveda
> <[email protected]> escribió:
>>
>> Hazlo de nuevo, las lineas interesantes se perdieron
>>
>> Dale un tail -fn100 /var/log/messages
>>
>> 2011/5/30 lorsyatenea <[email protected]>:
>> > adjunto el resultado del tail...
>> >
>> > --
>> > Lorsy Julio de la Espriella
>> > Desarrollador web.
>> > Tecnologa en Sistemas
>> > Embajadora Fedora Colombia-Latinoamerica
>> > Distrito Turistico y Cultural Cartagena de indias
>> >
>> >
>>
>>
>>
>> --
>> "My name is Ozymandias, king of kings:
>> Look on my works, ye Mighty, and despair!"
>> Percy Bysshe Shelley
>> http://sites.google.com/site/carlossepulveda
>
>
>
> --
> Lorsy Julio de la Espriella
> Desarrollador web.
> Tecnologa en Sistemas
> Embajadora Fedora Colombia-Latinoamerica
> Distrito Turistico y Cultural Cartagena de indias
>
>



-- 
"My name is Ozymandias, king of kings:
Look on my works, ye Mighty, and despair!"
Percy Bysshe Shelley
http://sites.google.com/site/carlossepulveda

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