ok, so some basic information to get out of the way:
I'm in a corporate office that uses Group Policy to set settings. I am also NOT an administrator on my machine. Fiddler is, however, running elevated (or at least, it says it is)
Prior to last week, I have had IE9 with Fiddler4 and been able to use fiddler without issue. The major change that has happened in the interim is that IE11 was pushed to my machine. as soon as that happened, I have been unable to use fiddler.
I've done some tracking down with our Services team, and we found that our Anti-Virus/Malware/Spyware software is blocking Fiddler from making changes to proxy settings. We were able to validate this by first noticing a entry in the log of the Security software, but also by disabling the Security software and then run fiddler and it worked. The funny thing is, there have been no changes to the policy of the Security on the machines. The only change has been to move from IE9 to IE11.
So, I guess my question is this: I realize that since they are different versions, Fiddler will interact differently with ie9 and ie11, but was it really that big of a change to how it interacts that now the Security will catch it? We are just trying to understand this so that we can make smart changes to policies that can allow us to use Fiddler, but not be a large security hole.
Thanks in advance.