Cannot access WebEx meeting over Web Gateway SSL Scanner

Technical Articles ID: KB62664
Last Modified: 10/21/2021

Environment

McAfee Web Gateway (MWG)

Problem

You get a WebEx Meeting Manager notification similar to the following when you try to access a WebEx meeting over Web Gateway SSL Scanner:

You are no longer connected to the meeting.....

Cause

It is not possible to access or attend a WebEx meeting when SSL Scanning is enabled on Web Gateway.

The reason is because SSL Scanning breaks into the encrypted traffic. WebEx encapsulates their proprietary protocol (which is not HTTP traffic) inside HTTPS. So, when the WebEx HTTPS traffic gets broken into by Web Gateway, it breaks the connection because Web Gateway expects HTTP traffic.

Solution

Add a bypass to your SSL Scanner.

Add a McAfee Managed list to your Subscribed lists:
This list contains the list of WebEx IP addresses to add to a bypass of the SSL Scanner. You need to verify that your engine is up-to date. Select your appliance from the list in Configuration and select Manual Engine Update.

Log on to the Web Gateway UI.
Select Policy.
Right-click Subscribed Lists and select Add.
For the name, type Webex IP Ranges.
Select the List content is managed remotely checkbox.
Select the McAfee Maintained List option.
Click Choose.
From Application URL Lists, select Webex IP Ranges.
Click OK and OK again.

Use the list in a rule to bypass the SSL Scanner:

Click Policy and find your SSL Scanner ruleset.
Select the top ruleset, usually SSL Scanner if using the default ruleset.
Click Add Rule, name it SSL Scanner Whitelist, and click Next.
Select If the following criteria is matched.
Click Add and from the drop-down list, select URL/Host Criteria.
1. From the list on the left, select URL.Destination.IP.
2. From the list in the middle, select is in range list.
3. From list on the right, select the list created in the previous set of instructions. In this example, the name is Webex IP Ranges.
Click OK.
Click Next.
For the action, select Stop Rule Set.
Review the summary of the rule for errors and then click Finish.
Click Save Changes at the top right.

Related Information

Keywords: ww 1491, webwasher csm, web gateway, web gateway 7, webex, ssl scanning

Previous Document ID ^(Secured)

3051

Affected Products

Web Gateway 8.1.x (EOL)
Web Gateway 8.0.x (EOL)
Web Gateway 7.8

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Knowledge Center

Cannot access WebEx meeting over Web Gateway SSL Scanner

Environment

Problem

Cause

Solution

Related Information

Previous Document ID ^(Secured)

Affected Products

Languages:

Title

Title

Knowledge Center

Cannot access WebEx meeting over Web Gateway SSL Scanner

Environment

Problem

Cause

Solution

Related Information

Previous Document ID (Secured)

Affected Products

Languages:

Choose your region

Title

Title

Previous Document ID ^(Secured)