DNS switch on its own?? Why? Ever seen this before?

[Majorossy]

Hey all,

this is my first thread here, was refered to you guys by CodeGuru (which i love by the way). So heres my sitch

I send out about 5,000 emails a day to subscribers for my company. Was having trouble the other day with emails 'hanging' in the que and not going out, im using SMTP services through IIS 5.0 on a windows 2000 os. I realized through some research, that the Primary DNS i was using is a very popular one, i contacted my host recieved some new DNSs and switched both my Primary ans Alternate DNS through my networksettings for my connection. Everything worked out great. Emails went out que was clean, next day, great again. Come into work today (no one else has acces to this machine) and the DNS is back to the settings from the other day! Somhow it switched on its own AND it remembered it old DNS numbers for both Prim and Alt. I have no idea how this happened and it makes me scared :). I did reboot after the initial change and it did work smoothly foor two days, and i was only away from the machine for about 7 hours AND I CAN GAUREENTEE I DID NOT DO THIS ACIDENTLY.

So... is there a way that a DNS can change on its own? Or revert back to its privious settings, where would it stor this information?


Thanks,
Fishtopher

[jdc2000]

What version of Windows (or other OS) are you using? The only thing I can think of is that the PC rebooted due to a power glitch or some other reason and the settings got reset.

[Majorossy]

umm... running Windows 2000, and ther defiently was no reboot, i would have seen it in my log reports. I dont see how a reboot would reset settings that are not related to a registry type function, especially after it had a reboot with the new settings, ya know?

[Tuttle]

Are you sure there's no spyware or other nasty stuff hanging around on that machine?

[jdc2000]

A re-boot (or crash & re-boot) on some Windows versions combined with what Windows thinks is a corrupt registry can result in Windows re-booting and restoring a previous copy of the registry, which would have wiped out your DNS changes. I've seen it happen. No re-boot, I'd check for spyware and viruses next, just to make sure none are present.