🆕 Coming soon (updated July 2026): Adyen is adding two new terminals — the S1E4 Pro (rugged mobile terminal) and S1F4 Pro (portable with built-in printer). The S1F4 Pro live pilot begins the week of August 24, 2026, with General Availability depending on the pilot (best case ~6 weeks after); the S1E4 Pro won't be available until 2027. See the overview articles to get familiar with specs and availability.
1. Check Terminal Display Icons
Look at the top row of the terminal screen.
Ensure the expected connection icons are visible:
✅ Wi-Fi symbol — if you're using a Wi-Fi connection.
☁️ Cloud symbol — if using a Terminal API (TAPI) integration via cloud communications.
If either of these icons is missing, it's an early indication of a connectivity issue.
2. Access the Diagnostics Menu
🔘 For Non-Android Terminals (older menu structure):
Tap Admin Menu
Navigate to Network > Diagnostics
📱 For Android Terminals:
Go to Settings
Select Diagnostics
3. Run the PSP Connection Test
In the Diagnostics menu, select PSP Connection
Wait for the test to complete
Review the result:
✅ Successful (Android) or ✔️ Green check marks (non-Android) = connection is good
❌ Failed or ❌ red X icons = something went wrong (see troubleshooting below)
4. Run the Terminal API Test
Go back to Diagnostics
Select Terminal API
Wait for results
If the test fails, also check:
Local communications TLS test for secure internal communication issues
5. Run the Endpoints Test
Return to Diagnostics
Select Endpoints
The terminal will test four Adyen URLs
Review results:
✅ All passed = good
❌ Any failed = follow error-specific guidance below
🔍 Understanding PSP Connection Test Errors
If a test fails, subsequent steps often show ❌ due to cascade failure. Here's what each step means:
Test Step | Issue if Failed (❌) |
Looking up host | DNS issue. Terminal can't resolve Adyen domains. |
Connecting | Network issue. Could be: |
Router malfunction
Internet is down |
| Negotiating | TLS negotiation failed. Possibly due to:Gateway is inspecting TLS traffic (wait or bypass)
Serious network/security issue (contact Adyen) |
| Writing data | Outbound traffic is blocked by firewall/router settings. |
| Receiving data | Inbound traffic blocked. Check firewall/router.Note: If the overall test says No Error, and this is your first-time setup, you can ignore this error.|
✅ Interpreting Results
On Non-Android Terminals:
✔️ = Step passed
❌ = Step failed
On Android Terminals:
Successful = All tests passed (tap to view details)
Failed = One or more tests failed (tap for ❌ step-by-step breakdown)
If the customer continues to see ❌ errors even after checking the above, suggest they contact Adyen support or their IT team for firewall and network rule review.