Microsoft KB Archive/216249

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

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Q216249

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The information in this article applies to:


 * Microsoft Windows 95
 * Microsoft Windows 95 OEM Service Release, versions 2, 2.1

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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 is now available from Microsoft, but it is only intended to correct the problem described in this article and should be applied only to systems experiencing this specific problem. This fix may receive additional testing at a later time, to further ensure product quality. Therefore, if you are not severely affected by this 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 about support costs, please go to the following address on the World Wide Web:

http://support.microsoft.com/directory/overview.asp

NOTE: In special cases, charges that are normally incurred for support calls may be canceled, if a Microsoft Support Professional determines that a specific update will resolve your problem. Normal support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

  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 that are 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

Additional query words:

Keywords : kbnetwork osr2 win95

Issue type : kbprb

Technology : kbWin95search kbOPKSearch kbWin95 kbWin95OPKOSR2 kbWin95OPKOSR210