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Resolving DNS names with DNS.GetHostByAddress

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Jon Gilkison

I'm having quite a bit of trouble getting the System.Net.Dns class
working in my asp.net application.

Below is the simple line of code causing me grey hairs:

Response.Write("host
name:"+Dns.GetHostByAddress(Request.UserHostAddress).HostName);

Hitting this page from the internal network resolves the machine name,
but hitting this page from the internet, outside of the local network,
results in the following error:

The requested name is valid and was found in the database, but it does
not have the correct associated data being resolved for

I'm sure this is a security thing, but I can't figure it out for the
life of me ... anyone?

Reply to this message...

Mitch Denny (VIP)

Jon,

I just tried the code, on my local system and it worked OK,
it might have more to do with the DNS configuration of the
server than the code itself. If your server is configured
such that it is pointing to an internal DNS it might not
be able to resolve the public addresses.

Experimentation with my infrastructure didn't show up
the problem either from interal access or Internet
access, or indeed access using an anonymising proxy.

----------------------------------------
- Mitch Denny
- Click here to reveal e-mail address
- +61 (414) 610-141
-

-----Original Message-----
From: Jon Gilkison [mailto:Click here to reveal e-mail address]
Sent: Wednesday, 22 May 2002 15:35
To: ngfx-io
Subject: [ngfx-io] Resolving DNS names with DNS.GetHostByAddress

I'm having quite a bit of trouble getting the System.Net.Dns class
working in my asp.net application.

Below is the simple line of code causing me grey hairs:

Response.Write("host
name:"+Dns.GetHostByAddress(Request.UserHostAddress).HostName);

Hitting this page from the internal network resolves the machine name,
but hitting this page from the internet, outside of the local network,
results in the following error:

The requested name is valid and was found in the database, but it does
not have the correct associated data being resolved for

I'm sure this is a security thing, but I can't figure it out for the
life of me ... anyone?

| [ngfx-io] member Click here to reveal e-mail address = YOUR ID
| http://www.aspfriends.com/aspfriends/ngfx-io.asp = JOIN/QUIT

Reply to this message...

System.Net.Dns

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