Arduino UNO and ESP8266 not accessible from app

[Flopp]

Do you use a Blynk Cloud or Local Server?

See this topic for Port

Port Forwarding

Global Port Range - this is ports you want to open for world. Blynk uses 8443, 8442. 8441. So you need to specify those 3. Base Host Port - not sure what is that. Usually for port forwarding you need to specify how to forward public ports to private ports. So here I suppose should be same ports as in “Global Port Range”. Protocol - TCP/UDP.