Microsoft KB Archive/314973

= &quot;Unable to write file&quot; error message is displayed after you add local APPC LU =

Article ID: 314973

Article Last Modified on 2/19/2007

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APPLIES TO


 * Microsoft SNA Server 4.0
 * Microsoft SNA Server 4.0 Service Pack 1
 * Microsoft SNA Server 4.0 Service Pack 2
 * Microsoft SNA Server 4.0 Service Pack 3
 * Microsoft SNA Server 4.0 Service Pack 4
 * Microsoft Host Integration Server 2000 Standard Edition
 * Microsoft Host Integration Server 2000 Service Pack 1

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This article was previously published under Q314973



SYMPTOMS
If you try to save an SNA Server or Host Integration Server (HIS) 2000 configuration file (Com.cfg) after you add local Advanced Program-to-Program Communications (APPC) logical units (LUs), an &quot;Unable to write file&quot; error occurs.

The new local APPC LUs that you added are not saved in the configuration.

This is only likely to occur with very large SNA Server or HIS 2000 configurations. The following list includes some configuration parameters that increase the chance that this problem will occur:
 * There are more than 2,000 local APPC LUs.
 * Implicit Incoming Remote LU is configured for the local APPC LUs.
 * Implicit Incoming Mode is configured for the remote APPC LUs.



CAUSE
The SNA Server or HIS 2000 configuration dynamic link library (DLL) incorrectly exceeds the maximum value for the number of internal records that are needed when you save large configuration files. This results in the &quot;Unable to write file&quot; error when you save the configuration.



RESOLUTION
SNA Server 4.0:

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Microsoft SNA Server version 4.0 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question. The English version of this fix should have the following file attributes or later:

NOTE: Because of file dependencies, the most recent fix that contains the preceding files may also contain additional files. Host Integration Server 2000:

No fix is yet available for this problem in Host Integration Server 2000.



STATUS
SNA Server 4.0:

Microsoft has confirmed that this is a problem in Microsoft SNA Server versions 4.0, 4.0 Service Pack 1, 4.0 SP2, 4.0 SP3, and 4.0 SP4.

Host Integration Server 2000:

Microsoft has confirmed that this is a problem in Microsoft Host Integration Server 2000 and Host Integration Server Service Pack 1.



MORE INFORMATION
SNA Server 4.0 and HIS 2000 support a maximum of 3,000 local APPC LUs per SNA Server service.

For more information on problems that can cause an &quot;Unable to write file&quot; error when you save an SNA configuration file, click the following article number to view the article in the Microsoft Knowledge Base:

293879 &quot;Unable to write file&quot; error after changing Com.cfg

Additional query words: HIS 2000

Keywords: kbbug kbfix kbqfe KB314973

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