As it considers it as an attack from an outside source or from a Wan, in other words the update or download from the steam server ok. You can find this i your router under the connected devices section, where it lists the name of the computer and the IP address the router assigned it.
Next in the table will be the port address or range from and to to open or keep open. Last depending on your router us the protocol UDP or TCP, with some routers you have to set up a Tcp with the same port range required and duplicate it for UDP as well as an entry in port forwarding.
As a small note if the HW fire wall is on, then turn off any software based firewall protection on the computer it`s self, two fire walls can conflict and cause cut off of downloads ect or lag, speed limitation when downloading ok. Check the conditions related to the firewall, options like IP flood protection can be turned off. If you are using steam to download games, or updates, in the port forwarding section of the router menu set up the ports that steam uses for data transmission. Steam Client This one : UDP 27000 to 27015 inclusive (Game client traffic) This one : TCP 27014 to 27050 inclusive (Steam downloads) UDP 27015 to 27030 inclusive (Typically Matchmaking and HLTV) UDP 2706 (incoming, for In-Home Streaming) TCP 2707 (incoming, for In-Home Streaming) UDP 4380 As you can see in the list there are ports that in some routers need to be set up to avoid the router cutting the download,or updates of mid downloading ect.
Some routers trigger a cut off of all internet downloading when IP flooding is triggered when enabled. First in port forwarding, give the service a name for each set of UDP or TCP port ranges setup. It will ask you to enter an IP address of the machine running steam, the IP address the router gave your computer.
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