Web service name resolving error when attempting to call a web method

I have a website that calls an interal login web method at webservice.mycompany.local/login.asmx

Every once in a while I get the following error:

System.Web.HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.Net.WebException: The remote name could not be resolved: 'webservice.mycompany.local'

Sometimes just trying the call over and over again will not work and I have to wait about 10 minutes for the name to be resolved, or if I go to the server and do an "ipconfig /flushdns" it usually fixes this issue.

 Any idea what is going on? I've experienced this problem in another intranet environment as well and can't seem to figure it out. I'm don't want to have to resort to changing all of the web references in my code to a hard-coded IP address. Thanks

6/29/2007 4:31:36 PM
asp.net.xml-web-services 7071 articles. 0 followers. Follow

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You shouldn't have to change your code to use an IP address.  Instead, change the computer/server to use a static IP Address.  This way, it will always have the same IP, and DNS update lags wouldn't affect you.

MCP - Web Based Client Development .NET 2.0
6/29/2007 4:43:45 PM

The server hosts both the asp.net website and the web service and has a static IP. The server also runs the DNS service. It doesnt' make sense why the website can't resolve the name to the web service...

6/29/2007 5:02:40 PM

What is the first dns server listed for the server?  It should list itself as the primary DNS, as it holds all the information for domain machines (i.e., mypc.mydomain.local).  Set the primary DNS to, to tell the PC to ask itself where things are, then set the Alternate DNS server to your gateway (or whatever else you may have acting as a bridge between the two).


MCP - Web Based Client Development .NET 2.0
6/29/2007 5:16:38 PM

The server already lists one of its own externally routable IP addresses as its DNS server. The alternate DNS IP is Why would changing the primary DNS server to help if the current IP 70.182.etc is already assigned to the machine? Thanks

6/29/2007 5:23:15 PM is just a loop back address.  I'm not saying it's any better than using the actual IP of the machine, just giving you the suggestion of making the computer look internally for the file.

One other problem you may be having (since you said "one of its own externally...IP addresses") could be IIS configuration (this is deployed, right?).  In IIS, you can assign a specific IP address to handle web resources, and if only one is assigned, that could be your problem. 

If your server has 3 IP addresses, and you attempt to connect to the web resource with any IP other than what IIS is set up to handle, you won't be able to access the resource.  I'm not sure if using a loop back address would be any better at handling this or not, but you could try.

If IIS is your problem, open it up and right-click your website, choose 'Properties'.  Click the 'Web Site' tab, and at the top is a dropdown list labeled "IP address:".  If this shows a specific IP, that could be a problem. You can either a) select "[All Unassigned]" from the dropdown list, or click the "Advanced" button and add the rest of your IP addresses to the table.


Let me know if this helps.

MCP - Web Based Client Development .NET 2.0
6/29/2007 5:55:53 PM



Yes these services are deployed in a live environment. The web service is configured to [All Unassigned] IP addresses with the host header webservices.mydomain.com, which is correct.

 Again, this problem is intermittent so I dont think the IIS properties for the IP address are the issue. The server has about 6 IP addresses. and the web service URL resolves to an IP assigned to the machine.

 I've searched and searched online and have only found a few other reports of this issue, however, I do know that one of my IT buddies had the same problem and he created a complex workaround to do an IPconfig /flushdns from the asp.net application itself when it detects this error, but I would rather resolve the problem at its source.

 Here is another person who is encountering the same issue:



6/29/2007 6:43:11 PM

Here is some more info that may help out:

 The server has 6 ip addresses...70.etc.etc.etc

One of those 70 addresses is the primary dns, the secondary dns is

 The web service name is in the format webservices.companyname.local, which the DNS server resolves to, the internal IP of the machine hosting the web service/website, and DNS.

The webservices record in webservices.companyname.local is a CNAME that points to the A record "mybox" which is

I'll go ahead and try the suggestion. Please let me know if you have any more thoughts on this issue. Thanks so much for your replies, I appreciate it!

6/29/2007 6:50:53 PM

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