Microsoft KB Archive/293879

= &quot;Unable to Write File&quot; Error After Changing Com.cfg =

Article ID: 293879

Article Last Modified on 2/19/2007

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APPLIES TO


 * Microsoft Host Integration Server 2000 Standard Edition
 * 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

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This article was previously published under Q293879



SYMPTOMS
Attempting to save an SNA Server or Host Integration Server 2000 configuration file (Com.cfg) after making a configuration change results in an &quot;Unable to write file&quot; error.

The configuration changes that were made are not saved in the configuration.



CAUSE
If the addition of a new APPC mode causes the amount of memory needed to store APPC mode records to exceed 64 KB in the SNA Server/Host Integration Server 2000 configuration file, a calculation is done to resize the amount of memory needed. This calculation is being done incorrectly, which prevents the addition of more APPC mode definitions.



SNA Server 4.0
A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends 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 Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

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 typical 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
To resolve this problem, obtain the latest service pack for Host Integration Server 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

328152 How to Obtain the Latest Host Integration Server 2000 Service Pack



SNA Server 4.0
Microsoft has confirmed that this is a problem in Microsoft SNA Server versions 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3, 4.0 SP4.

Host Integration Server 2000
Microsoft has confirmed that this is a problem in Microsoft Host Integration Server 2000. This problem was first corrected in Host Integration Server 2000 Service Pack 1.



MORE INFORMATION
The problem described in this article may occur when you are making any number of configuration changes if the SNA Server or Host Integration Server 2000 configuration file contains a large number of objects. However, the number of objects at which this problem may occur cannot be provided here because it depends on various other configuration variables.

The following are examples of two scenarios that result in the &quot;Unable to write file&quot; error:
 * Adding new APPC Mode definitions to the SNA Server/Host Integration Server 2000 configuration.
 * Assigning existing LUA (logical unit application) LUs to existing LUA pools.

NOTES: In this case, no new objects were added to the SNA Server/Integration Server 2000 configuration.

The error occurs because the new association created by assigning the LUA LUs to the LU pools required additional memory to store the objects.

For additional information on another problem that can cause an &quot;Unable to write file&quot; error when you save an SNAconfiguration file, click the article number below to view the article in the Microsoft Knowledge Base:

314973 &quot;Unable to Write File&quot; Error Message Is Displayed After You Add Local APPC LU

Additional query words: HIS 2000

Keywords: kbbug kbfix kbhostintegserv2000presp1fix kbhostintegserv2000sp1fix KB293879

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