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xs4all ONLY issues with ADSL sync and Fritz!Box 7340

Posted by jpluimers on 2011/08/26

Recently, I had big problems with my Fritz!Box 7340 losing ADSL sync on my xs4all ONLY connection.

The odd thing is: the problems started after it worked well for quite a while.

I had multiple dozens of these reconnects per day, sometimes as few as once every fre hours, but often as many as half a dozen per hour:

11.07.11 05:14:08 IPv6 Internet connection established successfully. Prefix: 12ab:34cd:56ef::/48
11.07.11 05:14:08 IPv6 Internet connection established successfully. IP address: 12ab:34cd:56ef::fe01dc23:ba45:9867
11.07.11 05:14:07 Internet connection established successfully. IP address:, DNS server: and, Gateway:
11.07.11 05:14:01 DSL is available (DSL synchronization exists with 10007/1029 kbit/s).
11.07.11 05:13:47 DSL synchronization starting (training).
11.07.11 05:13:32 Internet connection cleared.
11.07.11 05:13:32 IPv6 Internet connection was cleared; prefix no longer valid.
11.07.11 05:13:32 Internet connection cleared.
11.07.11 05:13:31 DSL not responding (no DSL synchronization).

The xs4all helpdesk didn’t respond on my emails, and Google searches didn’t reveal much.

This is what I tried:

  1. I tried getting the FRITZ.Box_Fon_WLAN_7340.en-de-es-it-fr.99.05.04-19769.image firmware, mentioned in this thread, but could not download it any more.
  2. I also tried to set the DSL settings to “maximum stability” without any improvement, resetting to factory settings, etc.
  3. The router is already very close to the ISRA point (where DSL enters the house), and I tried both with/without splitter with no improvement whatsoever.
  4. Read the steps in this sat4all thread, but found nothing unusual in my hardware and software config.

I didn’t expect any improvement as nothing on my side has changed, and before xs4all ONLY, I ran DSL for more than 10 years with different modems and no problems whatsoever.

Finally, I downgraded to Firmware-Version 99.04.88 from Firmware-Version 99.04.90.

When downgrading, keep this in mind:

  • Fritz! does not keep old firmware versions on-line; you must regularly get the Fritz!Box 7340 part of their ftp site and keep an archive yourself
  • It will reset your router to factory state and not remember any settings
  • It cannot restore your settings if you saved them with a higher firmware version, not even when you save them with a password as the web-interface seems to suggest

Luckily, one of the things that xs4all did well, is keep an archive of firmware versions for the Fritz!Box 7340, including a Firmware-Version 99.04.88.

Perform these steps when downgrading:

  1. Download your firmware settings
  2. Print all pages of settings in the web interface (print to PDF, or some other electronic form for copy/paste later when reconfiguring)
  3. Upload the firmware to your modem
  4. Connect your modem to a computer using a LAN cable
  5. On the computer perform a ipconfig /release followed by a ipconfig /renew to get a fresh IP address
  6. On the computer perfor a ipconfig to find the new default gateway on which the Fritz!Box sits
  7. In your web browser, brows to the default gateway (usually
  8. Setup a new password
  9. Reconfigure the Fritz!Box from scratch using the printedsettings
  10. Save your firmware settings, using both the Firmware-Version and a timestamp as part of the filename (that way you can find when you saved it, and with which firmware it can be restored).

I had a truckload of settings, so it took me more than 2 hours to figure all this out and restore the settings by hand.

This is how it performs now with Firmware-Version 99.04.88:

Empfangsrichtung Senderichtung
DSLAM-Datenrate Max. kBit/s 10008 1032
DSLAM-Datenrate Min. kBit/s 4512 512
Leitungskapazität kBit/s 13056 1025
Aktuelle Datenrate kBit/s 10007 1025
Latenz 7 ms 1 ms
Trägertausch (Bitswap) an an
Nahtlose Ratenadaption aus aus
Impulsstörungsschutz (INP) 1.1 0.0
Stromsparmodus L2 NA
Störabstandsmarge dB 10 6
Leitungsdämpfung dB 29 22
Leistungsreduzierung dB 0 0
Trägersatz B43 B43
Sekunden mit Behebbare Fehler (FEC) Nicht behebbare Fehler (CRC)
Fehlern (ES) vielen
Fehlern (SES)
15 Minuten
15 Minuten
FRITZ!Box 166 1 30 1008 0.06 1
Vermittlungsstelle 0 0 0 0 0 0

No problems for multiple days, just like it was in the past.


One Response to “xs4all ONLY issues with ADSL sync and Fritz!Box 7340”

  1. […] Then I started to get sudden disconnects. Sometimes dozens per day, each for a few minutes. Their helpdesk auto responder did not indicate they would not process incoming mail, only asked to use the online wizard. No words like “instead”, or “won’t respond on email”. For a provider with a premium price like XS4ALL, I expected them to process the email. They didn’t. […]

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