| Issue | Likely Fix | |-------|-------------| | "Portal unreachable" | Check internet first. Ensure no firewall blocks UDP port 4501. Try a different network (e.g., hotspot). | | Authentication fails | Verify netname and password. Reset password at my.concordia.ca. | | MFA not prompting | Reinstall Duo Mobile. Check if time sync is off (iOS/Android: set automatic time). | | Connected but no internal access | Flush DNS ( ipconfig /flushdns on Windows; sudo dscacheutil -flushcache on macOS). Reconnect. | | Slow speeds | VPN adds overhead. Try switching to a closer VPN gateway (if multiple offered). Use split tunneling if allowed. |