Tailscale Funnel: ports, limits, bandwidth
Tailscale Funnel accepts only ports 443, 8443 and 10000. Here are the prerequisites, the bandwidth reality, and how to check yours is serving.
#ports
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Arr stack ports: what each app listens on
Default ports for Sonarr, Radarr, Prowlarr, Bazarr, qBittorrent, Jellyfin, Seerr and FlareSolverr, plus how to keep every one of them off the public internet.
FTP vs SFTP vs FTPS: ports and safety
FTP uses TCP 21 plus a separate data channel, FTPS adds TLS, SFTP rides SSH on port 22. Which ports to open, and why plain FTP leaks your password.
Check if a port is open on Linux
See what is really listening with ss, then test the port from outside with nc or nmap. Learn why a blocked port hangs while a closed one refuses at once.
Fix kubelet port 10250 errors on Ubuntu
Port 10250 is the kubelet API. Fix the address already in use error on kubeadm init, and the firewall drops that break kubectl logs and exec.
SSH: Connection Refused vs Connection Timed Out
Two SSH errors, opposite causes. Refused means the server answered. Timed out means nothing answered at all. Learn which test to run, and from where.
What ports are and how Linux services listen
A port is how a server sorts incoming traffic to the right service. Learn to read what is listening with ss, and tell a local port from a public one.