Load Testing with MultiFactor Websites

Please excuse my ignorance but I do not understand what are these "multifactor aspects on the webpage" you speak of. I fully understand what cookies are and how they are generally used. I also understand what a GUID is, but can you please explain how they are being used in your web application?

Once I understand these details then I'll be able to assist you with getting our load testing feature to work with it.

Here's an idea that may work, depending on how the authentication is performed at the HTTP level of your web application. We support data driving load tests. The data source can be an external file (Excel spreadsheet, XML file, CSV file) or a SQL database. If you can come up with some mechanism whereby the required dynamically changing challenge data (e.g. string or number sent in text message to cell phone) is placed into the data source just prior to running the load test, then the load test can pull the data from your data source, use it in the authentication process and continue on its merry way.

If you use a SQL data base you could even go so far as to create a stored procedure that automatically runs on a regular basis to maintain the correct value needed by the load test.

Do you think this approach might work?

Yes that is possible. If you scroll down to the middle of this page you can see how you can enter your own T-SQL statements i.e. execute your own SQL queries to get the data as part of the test initialization process.