Google Adsense not showing - Active perl overflow

Links:
Search engine optimisation advice
SEO check list.
My guess as to how Google page rank (PR) works.
Use of keywords and keywords meta.
YaBB forum: nofollow mod.
YaBB forum: title, description, keywords meta mod.

Symptom: http: ActivePerl overflow

For several weeks in early 1995 I saw intermittent blank spaces when viewing pages where the Adsense ads are supposed to show. At the same time the page loading progress bar at the bottom of the screen has moved slowly or stopped and frozen. A brief pop up has sometimes occurred, in the bottom right hand corner saying Symantec Norton intrusion detection and on investigation this has shown HTTP Active perl overflow intrusion detection.

Investigation of Adsense http: ActivePerl overflow

Examining the detail of the intrusion alert shows that the Google ads were the cause. By going to intrusion alert advanced setting there is long list of types on intrusion. It is possible to turn off the HTTP ActivePerl overflow detection.

Temporary fix:

Turn off the HTTP Active perl overflow intrusion detection. You need to open Norton Internet security. Go to intrusion detection and under advanced set up unclick the HTTP perl overflow detection.

Verification:

I went back and set the HTTP ActivePerl overflow detection back on and the problem of the ads not showing reappeared intermittently. Turning off the ActivePerl overflow detection removed the problem of the Google ads not showing.

The intermittent nature is not yet explained. It may have something to do with having previously run some javascript on the same page.

So further investigation is required:

If you have similar experience, please say if you think that other javascript higher up on the same page may be the cause, or if running some javascript on a previously viewed page sets up the fault condition. email me at eric@satsig.net

Page created 6 May 2005, last amended 8 June 2008 Eric Johnston Back to: Advice about making your site compatible with search engines - SEO