ReadMe for

MIMEsweeper for Web Version 5.0.4

This ReadMe describes the changes provided in this patch for MIMEsweeper for Web, lists the prerequisites for and contents of the patch, and explains how to install and remove the patch.

Contents

This document contains the following topics:

• Patch description
• Prerequisites
• File updates
• Installing the patch
• Removing the patch

Patch description

The MIMEsweeper for Web Version 5.0.4 patch provides the following changes:

Problems Resolved

• LDAP user lists are expanded on start-up and stored by MIMEsweeper for Web; the list is refreshed periodically (every 24 hours by default). Previously browsing would be temporarily interrupted whilst the refresh was in progress. In this version, browsing is not interrupted.
• When Proxy Access Control is configured to "Basic - LDAP", MIMEsweeper for Web will attempt to authenticate users by binding to the LDAP server specifying the users' credentials. Previously if the bind failed it could take up to 30 seconds before the user was informed that authentication had failed. In this version the user is informed immediately. (The problem was caused by retrying the bind specifying a different LDAP attribute. The retry has now been disabled, although it can be reinstated by editing a config file. This edit is required if you are using Exchange Server 5.5 as an LDAP server - see Using Exchange Server 5.5 as an LDAP Server for details.)
• Previously MIMEsweeper for Web would cache DNS look-up results for up to one hour, including look-up failures. This would lead to problems when using unreliable DNS servers. In this version successful DNS look-ups are cached for one hour by default and failed DNS look-ups are cached for one minute by default. It is possible to customize this behaviour by editing a config file. See Customizing the DNS cache for details.
• Previously it was possible for users to view files on the MIMEsweeper for Web server that were outside the Web server folder. In this version this is no longer possible.

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Using Exchange Server 5.5 as an LDAP Server

If you have LDAP User Lists that connect to Exchange Server 5.5, you need to add the following section to wsw.cfg:

[Proxy\ProxyServer\Authentication\LDAP]
v:RetryAttribute=$Scn

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Customizing the DNS cache

By default, this version of MIMEsweeper for Web caches successful DNS look-ups for one hour and failed DNS look-ups for one minute. You can customize this behaviour by editing the [Proxy\ProxyClient] section in wsw.cfg:

[Proxy\ProxyClient]
v:DnsMaxSize=$I4096
v:DnsEntryLifeTime=$I3600
v:DnsFailureLifeTime=$I60

where:

DnsMaxSize - This defines the maximum number of entries in the cache. It is recommended you do not alter this value unless specifically instructed to do so. The default is 4096 entries.

DnsEntryLifeTime - This defines the time in seconds that successful DNS look-ups are cached. The default is 3600 seconds (one hour).

DnsFailureLifeTime - This defines the time in seconds that failed DNS look-ups are cached. The default is 60 seconds.

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Prerequisites

Install this patch over the following version of MIMEsweeper for Web only:

• MIMEsweeper for Web Version 5.0.3

You must log on with the Administrator account that was used to install the original MIMEsweeper for Web product.

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Checking the version number of MIMEsweeper for Web

To check the version number of MIMEsweeper for Web:

1. Open the MIMEsweeper for Web Console.
2. Expand the MIMEsweeper Policy Editor snap-in and select the MIMEsweeper for Web folder.

   The version number is displayed at the bottom right-hand corner of the Status bar.

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Checking the version of a file

To check which version of a file you currently have installed on your system:

1. Navigate to the folder in which the files are installed:
   • MIMEsweeper for Web program: (by default, C:\Program Files\MIMEsweeper for Web\Program)
2. Right-click the filename and then click Properties.
3. Click the Version tab, and view the value in File version.

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File Updates

To verify your patch installation, you need to check the version number of installed program files.

If you need to remove this patch, you also need the version number of the previously installed files.

The table below shows the  files contained in this patch, listing their current version number at this patch update and any previous version numbers they replace.

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Installing the patch

Before installing this patch, ensure that you have read the Prerequisites section of this ReadMe.

Installing MIMEsweeper for Web Version 5.0.4

1. Stop the MIMEsweeper for Web services.
2. Close the MIMEsweeper for Web Console and any other programs running in MMC consoles, such as Performance Monitor, close the MMC console.
3. Ensure that the Windows Event Viewer is not running.
4. Open the MIMEsweeper for Web Program folder (by default, C:\Program Files\MIMEsweeper for web\Program):
5. Rename the files to be replaced in this patch. For example, add a .old extension after the existing file extension.
6. Copy the replacement files supplied with the 5.0.4 patch to the MIMEsweeper for Web Program folder.
7. Check the version number of the new file to ensure that the version number matches that listed in File updates.
8. Open the MIMEsweeper for Web Console and restart the MIMEsweeper for Web services.

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Removing the patch

If you experience problems after installing MIMEsweeper for Web Version 5.0.4, remove the patch as follows:

1. Stop the MIMEsweeper for Web services.
2. Close the MIMEsweeper for Web Console and any other programs running in MMC consoles, such as Performance Monitor, close the MMC console.
3. Ensure that the Windows Event Viewer is not running.
4. Restore the original files in the MIMEsweeper for Web Program folder (by default, C:\Program Files\MIMEsweeper for Web\Program):
   1. Delete the replacement files that you installed with this patch.
   2. Rename the files that you replaced back to their original name.
5. Open the MIMEsweeper for Web Console and restart the MIMEsweeper for Web services.

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Revision 1.0_c
Published by Clearswift Ltd. February 2004
© 2004 Clearswift Ltd
All rights reserved

The materials contained herein are the sole property of Clearswift Ltd. No part of this publication may be reproduced or disseminated or transmitted in any form or by any means electronic, mechanical, photocopying, recording, or otherwise stored in any retrievable system or otherwise used in any manner whatsoever without the express permission of Clearswift Ltd.

Information in this document contains references to fictional persons, companies, products and events for illustrative purposes. Any similarities to real persons, companies, products and events is coincidental and Clearswift shall not be liable for any loss suffered as a result of such similarity.

The Clearswift Logo and Clearswift product names including ES^TM, ENTERPRISEsuite^TM, ES ClearPoint^TM, ES ClearSecure^TM, ES ClearEdge^TM, ES ClearBase^TM, ES ClearSurf^TM, CS DeepSecure^TM, CS Bastion II^TM, CS X.400 Filter^TM, CS FlashPoint^TM, CS ClearDetect^TM, CS ClearSupport^TM, CS ClearLearning^TM, CS MIMEsweeper^TM, CS REMOTEmanager^TM, CS MAILsweeper^TM, CS MIMEsweeper for Web^TM, CS e-Sweeper^TM, CS IMAGEmanager^TM, CS SECRETsweeper^TM are trademarks of Clearswift Ltd.

All other trademarks are the property of their respective owners. Clearswift Ltd. (registered number 3367495) is registered in Britain with registered offices at 1310 Waterside, Arlington Business Park, Theale, Reading, Berkshire RG7 4SA, England. Users should ensure that they comply with all national legislation regarding the export, import, and use of cryptography.