strange (DNS related?) problem

Intel / Core2duo
January 24, 2009 at 00:43:38
Specs: Windows Vista 32, C2D, 2GB
Hi everyone,

I do have some serious network related issues, which I am not able to figure out - I hope to find some networking experts here which can shed some light on what is going on:

I am using Vista32, Intel Pro GB NIC, Zonealarm free.

The Symptoms are as follows - my computer starts up fine, networks run for an undefined amount of time, then hangs for a couple of minutes, meaning. if I open firefox e.g. it stops at resolving the hostname (usually google). This is the same with all other programs trying to connect to the internet. Then, a couple minutes later, all is fine again, _except_ I get strange DNS connections from a high random port on local 0.0.0.0 to my router at port 53. 2 UDP packages get sent, after that the port closes and everything continues...

I only stumbled upon this behaviour because after the internet "paused" Zonealarm will alarm me with an application "trying to act as server". (This is the opening of the local random port on 0.0.0.0).

I have Port Explorer logs for all this if this helps, I also managed to do one while the connection hung - this showed cyclic activity on localhost:

      15       24/01/2009 09:19:41   GEÖFFNET    TCP        0.0.0.0:0              0.0.0.0:0          ERFOLGREICH      0                              4216       c:\program files\mozilla firefox\firefox.exe
      16       24/01/2009 09:19:41   VERBUNDEN   TCP      0.0.0.0:49204         127.0.0.1:49203       ERFOLGREICH      0                              4216       c:\program files\mozilla firefox\firefox.exe
      17       24/01/2009 09:19:41  ANGENOMMEN   TCP     127.0.0.1:49203        127.0.0.1:49204       ERFOLGREICH      0                              4216       c:\program files\mozilla firefox\firefox.exe
      18       24/01/2009 09:19:41  GESCHLOSSEN  TCP     127.0.0.1:49203           0.0.0.0:0          ERFOLGREICH      0                              4216       c:\program files\mozilla firefox\firefox.exe
      19       24/01/2009 09:19:41   GEÖFFNET    TCP        0.0.0.0:0              0.0.0.0:0          ERFOLGREICH      0                              4216       c:\program files\mozilla firefox\firefox.exe
      20       24/01/2009 09:19:41    HORCHEN    TCP     127.0.0.1:49205           0.0.0.0:0          ERFOLGREICH      0                              4216       c:\program files\mozilla firefox\firefox.exe
      21       24/01/2009 09:19:41   GEÖFFNET    TCP        0.0.0.0:0              0.0.0.0:0          ERFOLGREICH      0                              4216       c:\program files\mozilla firefox\firefox.exe
      22       24/01/2009 09:19:41   VERBUNDEN   TCP      0.0.0.0:49206         127.0.0.1:49205       ERFOLGREICH      0                              4216       c:\program files\mozilla firefox\firefox.exe
      23       24/01/2009 09:19:41  ANGENOMMEN   TCP     127.0.0.1:49205        127.0.0.1:49206       ERFOLGREICH      0                              4216       c:\program files\mozilla firefox\firefox.exe
      24       24/01/2009 09:19:41  GESCHLOSSEN  TCP     127.0.0.1:49205           0.0.0.0:0          ERFOLGREICH      0                              4216       c:\program files\mozilla firefox\firefox.exe
      26       24/01/2009 09:19:42   EMPFANGEN   TCP     127.0.0.1:49204        127.0.0.1:49203       ERFOLGREICH      1                              4216       c:\program files\mozilla firefox\firefox.exe
      27       24/01/2009 09:19:42    SENDEN     TCP     127.0.0.1:49203        127.0.0.1:49204       ERFOLGREICH      1                              4216       c:\program files\mozilla firefox\firefox.exe
      28       24/01/2009 09:19:42    SENDEN     TCP     127.0.0.1:49203        127.0.0.1:49204       ERFOLGREICH      1                              4216       c:\program files\mozilla firefox\firefox.exe
      29       24/01/2009 09:19:42    SENDEN     TCP     127.0.0.1:49203        127.0.0.1:49204       ERFOLGREICH      1                              4216       c:\program files\mozilla firefox\firefox.exe
      30       24/01/2009 09:19:42   EMPFANGEN   TCP     127.0.0.1:49204        127.0.0.1:49203       ERFOLGREICH      2                              4216       c:\program files\mozilla firefox\firefox.exe
      31       24/01/2009 09:19:42   GEÖFFNET    UDP        0.0.0.0:0              0.0.0.0:0          ERFOLGREICH      0                              4216       c:\program files\mozilla firefox\firefox.exe
      32       24/01/2009 09:19:42  GESCHLOSSEN  UDP        0.0.0.0:0              0.0.0.0:0          ERFOLGREICH      0                              4216       c:\program files\mozilla firefox\firefox.exe

If this makes sense to anybody, I would be very happy to hear what could be causing this behaviour. If you need more information please let me know as well.

Many thanks

Markus


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#1
January 24, 2009 at 10:19:16
Does the same thing happen in safe mode? If it doesn't, run msconfig and go to the strartup tab. Uncheck whatever you don't need to load at boot time, reboot, click ok and see what happpens.

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