Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Few times a day every day I get something hitting my site on urls like this:

/MSOffice/cltreq.asp?UL=1&ACT=4&BUILD=6551&STRMVER=4&CAPREQ=0 /_vti_bin/owssvr.dll?UL=1&ACT=4&BUILD=6551&STRMVER=4&CAPREQ=0

The user agent is this: UserAgent Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; InfoPath.1; OfficeLiveConnector.1.3; OfficeLivePatch.0.0)

Looks like some sort of Microsoft bot? What its trying to do.

share|improve this question
up vote 6 down vote accepted

This is related to the Web Discussions Toolbar that comes with Office 2003 which is an add-in to Internet Explorer. IE is querying your site to see if it supports the extensions required to support this.

The only thing you can do to mitigate the problem is create /MSOffice/cltreq.asp as a zero length file on your server as this will be quicker to serve than a 404 page.

share|improve this answer
You beat me by a minute +1 – divitiae Oct 1 '09 at 10:43

It's not a bot.

Your users have Microsoft Office installed, and the discussion bar turned on in IE. IE is querying the server to see whether it supports web discussions.

share|improve this answer

These requests are generated when someone browses your site with Internet Explorer's Discussion toolbar enabled. You can safely ignore these requests.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.