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K14274: Multiple BIG-IP APM sessions may be created when uses favicon

Known Issue

Original Publication Date: Jun 26, 2014

Update Date: Mar 14, 2017

Known Issue

Websites that use a Favorite (favicon) may establish multiple sessions with BIG-IP APM.

This issue occurs when the following conditions are met:

BIG-IP APM access policy is configured with Portal Access or LTM + APM mode. The does not send the MRHSession cookie with the request for the favorite icon.

This issue is known to affect 25 and 10, but may also affect other browsers.

Impact

User access may be denied due to user licenses being exhausted.

Symptoms

As a result of this issue, you may encounter the following symptoms:

The system may establish multiple sessions for a single client IP address. The Favorite Icon may not be displayed in the browser.

Resolution

Status

F5 Product Development has assigned ID 406040 to this issue. F5 has confirmed that this issue exists in the products listed in the Applies To box, located in the upper-right corner of this article. For information about releases or hotfixes that resolve this issue, refer to the following table:

Type of Fix Fixes Introduced In Related Articles Release None None Hotfix None None

Workaround

To work around this issue, you can add an iRule to check for a favicon. request. To do so, perform the following procedure: Impact of workaround: Workaround works only with that use the favicon. file. The workaround does not work if the icon is defined by a different name.

1. Log in to the Configuration utility. 2. Navigate to Local Traffic > iRules > Create. 3. In the Name box, type a name for the iRule.

For example:

favicon

4. In the Definition box, type the following text:

when HTTP_REQUEST { if { [string tolower [HTTP::path]] ends_with "favicon.ico" and [HTTP::cookie "MRHSession"] eq "" } { ACCESS::disable }}

5. Click Finished. 6. Click Virtual Servers. 7. Click the name of the virtual server that is affected by this issue. 8. Click the Resources . 9. In the iRules section, click Manage. 10. From the Available column, select the iRule you previously created. 11. Click the << button.

The iRule moves to the Enabled column.

12. Click Finished.

Supplemental Information

K4918: Overview of the F5 critical issue hotfix policy

Applies to:

Product: BIG-IP, BIG-IP APM, BIG-IP Edge Gateway 12.1.1, 12.1.0, 12.0.0, 11.6.1, 11.6.0, 11.5.4, 11.5.3, 11.5.2, 11.5.1, 11.5.0, 11.4.1, 11.4.0, 11.3.0