Computer Blocking CORS OPTIONS Request

Question

This is driving me crazy! I\'m trying to work with Amazon S3 CORS requests and they are not working on my computer. It seems that my computer is blocking or ignoring the OPTIONS

Answer 1

The problem is the Web Security module of Cisco AnyConnect. In our case, we cannot uninstall AnyConnect or make any changes to it (large corporate setting where the change would be really expensive/time consuming). Fortunately, there seem to be two solutions that do work.

1. Cisco only blocks ports 80 and 8080 (other ports seem fine).
2. Cisco allows secure https requests.

So, if you have control over the server, either put it on a different port or use https and your users will be alright.