80% of Browser Type 'Other'

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arran
  • updated
Gradually over the last month of IIS logs were getting increasing percentage of users with Browser : 'other' and OS 'other'
Looking at the IIS logs there a number of GET requests without a browser defined - instead there is a dash '-' for example:

GET /pages/VSearch.aspx - 443 - 222.333.444.444 HTTP/1.1 - ASP.NET_SessionId=f443434bs155erk0op55 - toast.pancake.org 200 0 0 21282 183 998

IIS 7 server 2008R2....

When I navigate to the site in IE11/Chrome/Firefox I can see it recognises my browser verison - any ideas what could be causing this?
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Michael
You should check if there is any pattern for the requests without the useragent (browser/OS), e.g. maybe they all come from the same IP that belongs to some robot. To do it you should creata an exclude "Browser" filter with value ?* . In this case a report for requests without browser will be shown, so you will be able to check these requests only.