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Problem solved (but don't know how/why, I just re-applied the settings in the NAS)

I had to disconnect my Conceptronic CH3HNAS to replace the ventilator and now Windows 7 cannot find the network path to the NAS. I can login to the management console, I can ping to the NAS and...

OK, that's clear. Thanks for all the replies ans suggestions.

I can do a re installation, but if this is a Windows 7 problem it can return?

Well, that didn't last long, only 1 time connection. The second solution (rename hosts file) also no success.

slgrieb: I tried resetting the winsock settings and after the restart I had internet access! I'll try it a few more times and let you know.

Thanks for the reply, I will give it a try when I'm home.

The router was free when I started with ADSL. I'll try to get/borrow another router to test it. I have all settings information.

Tried it, but didn't help.

The firmware version is 4.0.2.0.0, but the most recent firmware is from 2005 or thereabout.

It's an Alcatel Speedtouch 510 from 2003.....

Changed it, but still no connection.

What I do not understand is that if I look in my router my PC has IP-address 10.0.0.191, but if I look at the details of the connection my adapter has IP-address 10.0.0.199

Shouldn't that be the...

Tried it (using it now) and works without a problem. So it is a Windows 7 problem.

Always worth a try!

No malware detected. It does not matter whch adapter I use, the onboard or the additional Realtek, both give the same problems.

Thanks for the info, will do tomorrow...

Thanks for your help. Could a test with Ubuntu be worth a trial?

Well, that is of course an option. What could be the cause of this behavior?

Another account, same problem.

Full scan done, no problems

I use Microsoft Security Essentials and Spybot Search & Destroy.
Both found no viruses / malware.
Try another one?

Guts3d,

Your solution works, thank you. Do I have to do this every time I logon (I tried it several times and had to do it each time)?
Was is the cause of this behaviour?

Thank you, I will do next time (I use Windows 7, but that makes no difference.)

Yes. I switched ports and cables, connected directly to router.

If I start computer I get no connection, if I then switch cable from the onboard networkadapter to the Realtek network card I do get...