Probleme mit Yum + Probleme mit Squid (Signal 6?)

[Markus]

Hallo zusammen,

seit heute morgen habe ich einige Probleme. Das komische daran, es wurde 
nichts an der Konfiguration geändert und es wurde auch sonst nichts 
verändert.

Wenn ich mit mit "# yum update" das System updaten will erhalte ich 
folgende Meldung:

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retrygrab() failed for:
  
http://download.fedora.redhat.com/pub/fedora/linux/core/2/i386/os/headers/header.info
  Executing failover method
failover: out of servers to try
Error getting file 
http://download.fedora.redhat.com/pub/fedora/linux/core/2/i386/os/headers/header.info
[Errno 4] IOError: <urlopen error >
----------------------------------------------------------------------------------------------

Wenn ich im Browser eine Seite aufrufen will erhalte ich folgende Meldung:

----------------------------------------------------------------------------------------------
The following error was encountered:

    * * Connection Failed *

The system returned:
/ (110) Connection timed out

/----------------------------------------------------------------------------------------------

Die Datei /var/log/messages enthält folgende Meldung

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Aug 30 22:42:38 server (squid): ipcache_init: DNS name lookup tests failed.
Aug 30 22:42:38 server squid[2655]: Squid Parent: child process 2744 
exited due to signal 6
Aug 30 22:42:41 server squid[2655]: Squid Parent: child process 2758 started
Aug 30 22:43:08 server (squid): ipcache_init: DNS name lookup tests failed.
Aug 30 22:43:08 server squid[2395]: Squid Parent: child process 2746 
exited due to signal 6
Aug 30 22:43:10 server (squid): ipcache_init: DNS name lookup tests failed.
Aug 30 22:43:10 server squid[2399]: Squid Parent: child process 2748 
exited due to signal 6
Aug 30 22:43:11 server squid[2395]: Squid Parent: child process 2760 started
Aug 30 22:43:13 server squid[2399]: Squid Parent: child process 2762 started
Aug 30 22:44:01 server (squid): ipcache_init: DNS name lookup tests failed.
Aug 30 22:44:01 server squid[2422]: Squid Parent: child process 2751 
exited due to signal 6
Aug 30 22:44:01 server (squid): ipcache_init: DNS name lookup tests failed.
Aug 30 22:44:01 server squid[2485]: Squid Parent: child process 2753 
exited due to signal 6
Aug 30 22:44:04 server squid[2422]: Squid Parent: child process 2764 started
Aug 30 22:44:04 server squid[2485]: Squid Parent: child process 2766 started
Aug 30 22:44:14 server (squid): ipcache_init: DNS name lookup tests failed.
Aug 30 22:44:14 server squid[2296]: Squid Parent: child process 2755 
exited due to signal 6
Aug 30 22:44:17 server squid[2296]: Squid Parent: child process 2768 started
Aug 30 22:45:21 server (squid): ipcache_init: DNS name lookup tests failed.
Aug 30 22:45:21 server squid[2655]: Squid Parent: child process 2758 
exited due to signal 6
Aug 30 22:45:24 server squid[2655]: Squid Parent: child process 2771 started
Aug 30 22:45:51 server (squid): ipcache_init: DNS name lookup tests failed.
Aug 30 22:45:51 server squid[2395]: Squid Parent: child process 2760 
exited due to signal 6
Aug 30 22:45:53 server (squid): ipcache_init: DNS name lookup tests failed.
Aug 30 22:45:53 server squid[2399]: Squid Parent: child process 2762 
exited due to signal 6
Aug 30 22:45:54 server squid[2395]: Squid Parent: child process 2773 started
Aug 30 22:45:56 server squid[2399]: Squid Parent: child process 2775 started
Aug 30 22:46:44 server (squid): ipcache_init: DNS name lookup tests failed.
Aug 30 22:46:44 server squid[2422]: Squid Parent: child process 2764 
exited due to signal 6
Aug 30 22:46:45 server (squid): ipcache_init: DNS name lookup tests failed.
Aug 30 22:46:45 server squid[2485]: Squid Parent: child process 2766 
exited due to signal 6
Aug 30 22:46:47 server squid[2422]: Squid Parent: child process 2778 started
Aug 30 22:46:48 server squid[2485]: Squid Parent: child process 2780 started
Aug 30 22:46:57 server (squid): ipcache_init: DNS name lookup tests failed.
Aug 30 22:46:57 server squid[2296]: Squid Parent: child process 2768 
exited due to signal 6
Aug 30 22:47:00 server squid[2296]: Squid Parent: child process 2782 started
Aug 30 22:48:04 server (squid): ipcache_init: DNS name lookup tests failed.
Aug 30 22:48:04 server squid[2655]: Squid Parent: child process 2771 
exited due to signal 6
Aug 30 22:48:07 server squid[2655]: Squid Parent: child process 2786 started
Aug 30 22:48:22 server sshd(pam_unix)[2783]: session opened for user 
root by (uid=0)
Aug 30 22:48:34 server (squid): ipcache_init: DNS name lookup tests failed.
Aug 30 22:48:34 server squid[2395]: Squid Parent: child process 2773 
exited due to signal 6
Aug 30 22:48:36 server (squid): ipcache_init: DNS name lookup tests failed.
Aug 30 22:48:36 server squid[2399]: Squid Parent: child process 2775 
exited due to signal 6
Aug 30 22:48:37 server squid[2395]: Squid Parent: child process 2822 started
Aug 30 22:48:39 server squid[2399]: Squid Parent: child process 2826 started
Aug 30 22:49:27 server (squid): ipcache_init: DNS name lookup tests failed.
Aug 30 22:49:27 server squid[2422]: Squid Parent: child process 2778 
exited due to signal 6
Aug 30 22:49:28 server (squid): ipcache_init: DNS name lookup tests failed.
Aug 30 22:49:28 server squid[2485]: Squid Parent: child process 2780 
exited due to signal 6
Aug 30 22:49:30 server squid[2422]: Squid Parent: child process 2831 started
Aug 30 22:49:31 server squid[2485]: Squid Parent: child process 2833 started
Aug 30 22:49:40 server (squid): ipcache_init: DNS name lookup tests failed.
Aug 30 22:49:40 server squid[2296]: Squid Parent: child process 2782 
exited due to signal 6
Aug 30 22:49:43 server squid[2296]: Squid Parent: child process 2835 started
----------------------------------------------------------------------------------------------

Auf dem System läuft Fedora Core 2 und Squid 2.5 Stable5. Als Linux 
Anfänger bin ich gerade etwas überfordert und hab echt keine Ahnung wo 
ich jetzt anfangen soll den Fehler zu suchen. Bei google habe ich bis 
jetzt noch nichts gefunden was mir weitergeholfen hätte. Bin wirklich 
für jede Hilfe dankbar.