DNS Client Does Not Try All Servers in the DNS Service List

ID: Q216249

The information in this article applies to:

Microsoft Windows 95
Microsoft Windows 95 OEM Service Release version 2
Microsoft Windows 95 OEM Service Release version 2.1

SYMPTOMS

When you run a DNS query and the query returns an error message (such as "Server failure [rcode 2]"), other servers in the list are not queried. The failure is passed back to the originator, even though another querying server in the list could complete the query.

CAUSE

Secondary servers are queried only if no response is received from the primary server in the server list.

RESOLUTION

A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next update that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp


   Version    Date              Size           File name
   -----------------------------------------------------
   4.10.1660  1/07/99 06:04pm   43,520 bytes   Rnr20.dll

NOTE: Due to file dependencies, the most recent hotfix or feature that contains the above files may also contain additional files.

NOTE: You must install the Winsock 2.0 Update to use this fix. For information about obtaining the Winsock 2.0 Update, please see the following article in the Microsoft Knowledge Base:

Q182108 Availability of Windows Sockets 2.0 for Windows 95

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article.

MORE INFORMATION

The DNS query algorithm has been modified to try other servers in the server list if an error response is received from a server that could be resolved by trying another server in the list. The new algorithm retries servers until:

The name query is answered successfully
An authoritative answer is received from a server that the requested host does not exists (rcode 3)
The server list is exhausted

Keywords : kbnetwork osr2 win95
Version : WINDOWS:95
Platform : WINDOWS
Issue type : kbprb