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Weird behavior after ISP opens 3 ports
Recently I got T-Mobile’s email asking for an software update for the CellSpot device (signal booster using internet). In the instructions, they require my asking my ISP to open 3 UDP ports: “1) UDP 123: Syncing clocks; 2) UDP 500/4500: VPN or IPSec tunnels, business application. If your ISP confirms the ports are open, ask them to add the CellSpot to a DMZ.” While doing this, my ISP arranged the changes to my iPhone, as they thought it was related to my cell phone. However, the next day I found I was no longer able to connect my iPhone X to one of my Apple TV by AirPlay or screen mirroring. It always shows “connection failure” whatever options I try. Trying to get tech support from Apple has been unsuccessful. Later I realized that this issue might have something to do with above ports opening. I think the changes should be applied to the CellSpot but not my iPhone. But I’m not able to identify it in my home network. Does anyone have the similar experience? Your input and help are sincerely appreciated! Thanks.