We cannot say what that might be offhand but the easiest way to resolve these conflicts would be to factory reset the router and/or modem. In some cases there is a corrupt or misconfigured setting within the router or modem. If necessary look at the documentation for your security and routing products to find out how to turn these options off.
Not all devices will have these options and the steps for turning these functions off will be different depending on the make/model/software version of the devices and programs involved. Security firewalls (Some ISP provided modems) Normally that is not an issue but we have seen situations where it can interfere with the delivery of the data for our games/voice chat.
Sometimes firewall or routing software/hardware will have some advanced settings to prioritize and manage types of network traffic. We do not have individual steps for specific modems or routers so if you need assistance accessing or updating the devices, contact the device maker/provider.
