Problem with connection to blynk and raspi 3

As per searching - Search results for 'nodejs port 8441 order:latest' - Blynk Community

Depends where it is installed on your RPi… search for this file blynk-node.js on your RPi and change it as shown here… to 9443 or 443

BTW, since you do need basic config in each sketch anyhow, there is no reason not to define it there. At least it gives more control when switching between Cloud and Local Server, etc.