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404 errors for 15% of AB-test views


We have recently implemented the AB-testing module for Episerver, but have run into a problem with 404 responses. For some AB tests, it is working just fine, but for a specific campaign about 15% of the requests end in a 404 response. Details about the campaign:

  • 50% of users are included in the test
  • For the first 15 minutes, no 404 responses appear
  • After 15 minutes, about 15% of the users receive a 404 response
  • The difference between A and B is the ordering of blocks in a content area

We do not see any errors in the logs indicating why certain requests return 404.

We think it may be a racing condition or similar, but do not know how to debug it further.

Has anyone experienced similar issues?
Does anyone have ideas about how to debug further?



Nov 23, 2017 14:25

Hi Thomas 

Please can you report this as an issue so developer support can investigate this for you?


Nov 27, 2017 20:21
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