General un-handled exception occurred during socket I/O read from web-server '%1' retrieving URI '%2'. Explanation message: '%3'.
This error occurs when the server abruptly closes the connection to the virtual user. Servers might close connections if the virtual user is detected as a security risk due to a invalid cookie, failed SSL negotiation, or an improperly formatted request.
Compare the request that was sent at run time (in the test log) to the one that is in the test. To determine if differences between the requests are valid, record the test again and compare the two requests.