Clients take a long time to log off an OWA session after you publish an OWA server and configure OWA forms-based authentication in ISA Server 2004

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SYMPTOMS

Consider the following scenario. You use a Web publishing rule in Microsoft Internet Security and Acceleration (ISA) Server 2004 to publish a Microsoft Outlook Web Access (OWA) server. You configure OWA forms-based authentication in ISA Server 2004. In this scenario, you find that it takes a long time to log off an OWA session.

Note This issue only occurs when you publish OWA servers in a closed environment where users have no access to the Internet.

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CAUSE

When a client logs off an OWA session, Microsoft Internet Explorer may make two unnecessary HTTP POST requests to the following URLs:

http://activex.microsoft.com/objects/ocget.dll
http://codecs.microsoft.com/isapi/ocget.dll

This occurs if the S/MIME control is not installed on the OWA client. The OWA logoff program that is part of the forms-based authentication in ISA Server 2004 causes these unnecessary HTTP POST requests. Therefore, it may take a long time to log off an OWA session in a closed environment where users have no access to the Internet.

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RESOLUTION

To resolve this issue, follow these steps:

Open the logoff_MSIERich_SMimeCap.htm file on the ISA servers that are part of the OWA server publishing. The logoff_MSIERich_SMimeCap.htm file is located inside the following folder:
%Windir%Program Files\Microsoft ISA Server\CookieAuthTemplates
Back up the logoff_MSIERich_SMimeCap.htm file.

Open the logoff_MSIERich_SMimeCap.htm file in Notepad, and then locate the following lines of code:

<OBJECT id="MimeNS" classid="CLSID:D801B381-B81D-47a7-8EC4-EFC111666AC0" VIEWASTEXT></OBJECT>
	<?IMPORT namespace="MIME" implementation=#MimeNS>
	<SCRIPT>
function hres(iErr){return iErr + 0xffffffff + 1;}
</SCRIPT>

Replace the lines of code that you located in step 3 with the following lines of code:

<SCRIPT language="JavaScript">
if (oClientCaps.isComponentInstalled("{b0f84fec-95ad-4f3e-8fc0-6bc1bbadbf0d}", "ComponentID"))
{
document.write("<OBJECT id='MimeNS' classid='CLSID:D801B381-B81D-47a7-8EC4-EFC111666AC0'></OBJECT>");
document.write("<?IMPORT namespace='MIME' implementation=#MimeNS>");
}
function hres(iErr){return iErr + 0xffffffff + 1;}
</SCRIPT>

Save the logoff_MSIERich_SMimeCap.htm file, and close Notepad.
Restart ISA services.

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MORE INFORMATION

If you replace the lines of code in the logoff_MSIERich_SMimeCap.htm file as described in the Resolution section, you must make sure that you use the following command to install the next ISA Server 2004 service pack (SP):

Msiexec /p Service_Pack_Name.msp REINSTALL=ALL REINSTALLMODE=amus /l*vx! Logfile_Name .log

Note Service_Pack_Name.msp is the name of the SP that you install. Logfile_Name.log is the file where you want all information to be logged in verbose format.

This command installs the updated version of the logoff_MSIERich_SMimeCap.htm file that will be included with the next ISA Server 2004 SP.

Note ISA Server 2004 SP2 is the current service pack.

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REFERENCES

For more information about similar issues, click the following article numbers to view the articles in the Microsoft Knowledge Base:

833705 (http://support.microsoft.com/kb/833705/ ) Internet Explorer makes two unnecessary POST requests to the Ocget.dll file when you log off Outlook Web Access (OWA) 2003

323207 (http://support.microsoft.com/kb/323207/ ) Internet Explorer makes unnecessary POST request to Ocget.dll for .cab files

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