"Unable to Write File" Error Message Is Displayed After You Add Local APPC LU (314973)


The information in this article applies to:

  • Microsoft SNA Server 4.0
  • Microsoft SNA Server 4.0 SP1
  • Microsoft SNA Server 4.0 SP2
  • Microsoft SNA Server 4.0 SP3
  • Microsoft SNA Server 4.0 SP4
  • Microsoft Host Integration Server 2000
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 "Unable to write file" 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 "Unable to write file" error when you save the configuration.

RESOLUTION

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:

File nameDateTime
Snacfg.dll12/18/20017:39

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 (SP) 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.

MORE INFORMATION

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

For additional information on problems that can cause an "Unable to write file" error when you save an SNA configuration file, click the article number below to view the article in the Microsoft Knowledge Base:

293879 Unable to Write File Error After Changing Com.cfg

Modification Type:MinorLast Reviewed:10/6/2005
Keywords:kbBug kbfix kbQFE KB314973
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