msxml3.dll Unspecified error trying to get httpObj.status.

Any "responseState" other than 4, especially if it is a state of 3, will return an error when attempting to access httpObj.ResponseText in your code.  So, it could be that you found a broken link and that the ResponseText object is not in a state that you can access.  so, it might be that you need to add additional checking to your code that, if a link comes back with a readyState of anything other than 4, that you would need to handle it differently.