Direct answer
When travelling, “setup and decisions” for a VPN during diagnosing or configuration typically means: (1) install and enable VPN on your device, (2) choose a connection profile that matches your goal (reliability vs. compatibility), and (3) verify each layer—VPN is connected, traffic routes through the tunnel, and name resolution/DNS behaves as expected—then adjust based on what fails.
How it works in practice
Start with operating conditions. Your VPN troubleshooting decisions change depending on whether you are on hotel Wi‑Fi, airport networks, mobile data, or a corporate network. If you can’t connect, the decision tree is usually: check general internet access first, then confirm the VPN client is enabled and connected, then check whether the problem is authentication (credentials), protocol/handshake compatibility, or local network restrictions.
For diagnosing after connection succeeds, focus on observable signals: does the VPN status show “connected,” can you reach internal/external targets you expect, and do DNS lookups resolve correctly through the VPN? Many “it’s connected but nothing works” cases are really routing or DNS behavior.
Practical context while travelling
Travelling adds variables: different countries, captive portals on Wi‑Fi, roaming behavior, and network policies can change how a VPN connects. If you switch networks, you may need to repeat the verification steps. Also, consider device-level factors: Wi‑Fi power saving, firewall permissions, time/date settings, and background app restrictions can affect how the VPN establishes and maintains connectivity.
Limitations to keep in mind
A VPN does not guarantee anonymity, safety, or access. Performance and availability vary by network, device, location, provider, and time. If you encounter failures, avoid concluding the VPN “doesn’t work” without checking whether the specific network blocks VPN handshakes, requires login via a captive portal, or has DNS-related complications.