a problem with Sophos Web Filter.

Hello, we have a problem with Sophos Web Filter. If this service is running on a computer - then when the user starts Mozilla FireFox - the program starts (it appears in the processes), but nothing else happens, the browser window itself does not open. But if you stop the Sophos Web Filter service on your computer and start FireFox again, then everything works. The second problem with the same service is as follows: When the service is running, we launch Internet Exploler - and opens the site for translations of the golden crown, the site loads, but if you try to enter, then the login window .. hangs tightly - and it is not possible to remove the process. But as soon as we stop the Sophos Web Filter service, then everything starts working as usual. We ask for help in solving the problem. Thank you!