Our IT group recently installed a fortinet appliance about 3 weeks ago. Almost immediately, we had DNS problems and no one could log into a critical-mission web-based application. That was resolved, but since then, we have been having major performance issues in that, sometimes, we are unable to log in or if we can log in, a simple search that used to take 1-2 seconds now takes 4-5 minutes, if it comes back at all. IT immediately ruled out the fortinet saying that becuase of it's location and function on the network, it does not affect internal applications. Hardware, network, virus, application, disk space, and MS SQL server have also been ruled out. IT is now recommending a complete re-install including OS, IIS and application, and if that doesn't work, next recommendation is to move the app out of the the HP Blade system it has been running on to a more traditional setup of individual servers.
I am not in system administration and such, instead I'm in data warehousing, so I really don't know much about this stuff. But, it seems to me that with all other things ruled out, it is just to big a coincidence that things broke as soon as fortinet was installed. is it really impossible for fortinet to affect internal applications, even in some indirect way? Any and all thoughts are welcomed!