Re: Truly unique number for a computer.

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Have you looked at using "Client Certificates" for this? If you use client
certs, you can configure IIS to reject connection attempts from systems that
either don't have a certificate or whose certificate has expired (or been
revoked, by you, of course). I don't know if you can then configure the
maximum number of connections but I suspect that you may also be able to do
that using IIS.

Client certificates will solve your problem.

--
--- Nick Malik [Microsoft]
MCSD, CFPS, Certified Scrummaster
http://blogs.msdn.com/nickmalik

Disclaimer: Opinions expressed in this forum are my own, and not
representative of my employer.
I do not answer questions on behalf of my employer. I'm just a
programmer helping programmers.
--
"UJ" <fred@xxxxxxxxxxx> wrote in message
news:ONi7B%23SvFHA.904@xxxxxxxxxxxxxxxxxxxxxxx
> Is there any number I can get that is truly unique for a computer that
> can't be changed? I want to have a system whereby I have a computer that
> accesses a web service based on some unique value that can't be changed.
> Or at least if it is changed, it's not changed frequently. (IP address
> won't work because that can change frequently).
>
> Here's my thought - the program boots up, finds some unique piece of
> information, sends that off to the web service who checks that against a
> master list. If the ID is there, everything is OK, if not - it stops dead
> (there of course would be a way to add the ID to the master list but that
> would involve human interaction.)
>
> This is for a system whereby when a user buys our product, we only allow x
> number of machines to connect to the web service and need to limit that.
>
> I've thought about MAC address but have been told that that can be
> spoofed.
>
> If there either a serial number or GUID available for the machine itself?
>
> TIA - Jeffrey.
>
>


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