Server ports are busy. Most probably server already launched. See C:\Users\radou\Desktop\Blynk Local server\.\logs for more info - Local Blynk Server - Blynk Community
Most Cyber Attacks Focus on Just Three TCP Ports
CyberDuck
Backup/Restore with Cyberduck on your on-premises object storage backend — OpenIO 20.04 documentation
Using Cyberduck
Protocols — Cyberduck Help documentation
File Transfers — Cyberduck Help documentation
LayerStack Tutorials - LayerStack - How to check if TCP / UDP port is open on Linux & Windows Cloud Servers