can we uniquely identify a client in ASP.net

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Hi
is there any way to <b>uniquely identify a computer</b> like MAC Address, or IP. I am using <b>C#, asp.net 3.5</b>. Actually i have a web system where i need to authenticate a user through login credentials and for a particular machine. user can login from registed machine only he cannot login from all the machines.

IP address is not a solution because it may change every time in case of dynamic IP's

please help

Posted 16-Feb-12 18:46pm

S.Aijaz

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Varun Sareen · Answer 1 · 2012-02-16T18:54:00

Solution 1

Dear Friend,

string[] computer_name = System.Net.Dns.GetHostEntry(Request.ServerVariables["remote_addr"]).HostName.Split(new Char[] { '.' });
            String ecn = System.Environment.MachineName;
            txtECN.Text = computer_name[0].ToString();

This link will do the thing for you:-

http://forums.asp.net/t/821809.aspx/1[^]

Don't forget to mark this as your answer if it helps you out.

Thanks

Posted 16-Feb-12 18:54pm

Varun Sareen

Comments

Bernhard Hiller 17-Feb-12 3:37am

It looks like problems could arise when the cmputer sits behind a proxy server or a NAT router - you'd get the "public" address/name, but behind might be several different computers.

Varun Sareen 17-Feb-12 11:23am

you may be right..as i have never tried this :)

S.Aijaz 17-Feb-12 12:10pm

yes the problems arise when router just discards mac adcress and other identity headers of the machine that originates a request and sends ip address of the router to the server. behind the router there may b a full city. for server all the requests are coming from same IP. for certain devices like data cards ip address changes every time you connect it to network. i surfed a lot but could not find a way to uniquely identify a client machine.