Phone companion connection
Phone companion not connecting? Bring your PC controls within reach.
Use your existing phone for selected PC readings, media and capture controls. Restore the setup in three checkpoints: open the current local page, pair with a fresh code and choose your companion sections. Start with the first step that is failing, then verify one useful control on the PC.
By SysCubes documentation team · Content reviewed
- Your phone browser
- PC-selected sections
- Trusted local network
Explore the interactive preview
Choose your first failed checkpoint
Check the network before the code
Use the current PC address on the same trusted LAN. Compare guest Wi-Fi, client isolation, VPN routing and the app's firewall permission.
Follow this checkUse this manual guide beside the PC panel and phone browser. Verify the connection and any control change in the app.
Choose what you see on the phone and follow the matching manual check beside SysCubes.
Quick answer
Page first, pairing second, controls third
If the phone companion is not connecting, first open the current PC address on the same trusted LAN. Pair with the current six-digit code within its five-minute window. If the page already opens, investigate pairing or module permissions instead of repeating network changes.
Checkpoint 1
When the phone cannot open the local page
Open the browser controls shared by your PC from the current Phone companion panel. Keep SysCubes running and confirm the companion is active. A bookmarked address can become stale after changing networks; copying yesterday's link is not a useful network test.
Use the address currently displayed on the PC
Scan the current QR code or enter its displayed address in the phone browser. Do not substitute localhost: that refers to the phone itself. Preserve the shown port and path.
Compare the local network
Connect the phone to the trusted LAN that can reach the PC. Ethernet on the PC is fine. Check guest Wi-Fi or client isolation if internet access works but the local page does not.
Check routing and the app's firewall permission
Check whether a VPN is routing local traffic elsewhere. In Windows Security, inspect the active network and the relevant app permission. Only classify a network as private when you trust it; managed networks may require their administrator.
Microsoft recommends allowing a recognized app through the firewall rather than opening an arbitrary port. Its firewall and network protection guide explains the available controls. Keep the firewall enabled and leave router port forwarding out of this local connection test.
Checkpoint 2
When the page opens but pairing fails
Once the pairing page opens, use the code shown in the current PC panel, including leading zeros. Each code has its own validity window and attempt limit. Read the fresh code after a successful pairing when adding another phone, or follow the panel's renewal instructions when the old code expires.
| Checkpoint | Current behavior | Next action |
|---|---|---|
| Code format | 6 digits | Use the current displayed code, including zeros. |
| Code lifetime | 5 minutes | Use Try again when the panel reports expiration. |
| Code reuse | Single-use; fresh code after a successful pairing | Use the new displayed code to add another phone while valid. |
| Pairing attempt limit | 5 attempts per issued code | Renew the attempt from the PC instead of guessing. |
A successful pairing preserves the shared credential and issues a fresh code for another phone. Use the current displayed code while valid; adding a phone does not require revoking the one already paired.
If that code expires or exhausts its attempts, a paired panel can show no code and instruct you to stop and start. Choose that deliberately: Stop companion and unpair revokes the shared credential for existing phones too. Closing SysCubes stops the live connection while preserving saved pairing.
Checkpoint 3
When connected controls are missing or disabled
Choose the relevant section in the PC companion panel and check whether you hid it in the phone layout. Then test the matching desktop widget: start a supported Windows media session for playback commands, or choose an available display for brightness. The phone uses the capabilities available on your PC.
For display selection, the current companion receives the first three display rows. A fourth desktop row may therefore be absent on the phone. Use the desktop for that row. Follow the separate brightness diagnostic workflow if a visible row rejects a change.
Keep the connection, code and PC controls in order
Open the current local page first
Use the address displayed on your PC. If a guest network reaches websites but blocks local devices, connect both devices through the same trusted reachable LAN before checking the code.
Read the live pairing code
Use the current six-digit code within its five-minute window. Successful pairing supplies a fresh code for another phone. Keep codes and credentials out of shared support screenshots.
Check the PC control before pairing again
If the phone is connected, inspect the section switch and matching desktop widget. Restore the Windows media session or supported display path first, then try the phone control again.
Verify the result and keep a useful failure report
Bring the phone browser to the foreground, reopen the current address and confirm live status before sending another command. Select a known player or display and try one reversible action. Verify the change on the PC; a moving slider alone is not proof that the device accepted it.
The SysCubes phone companion keeps selected controls close at hand when local connectivity and the underlying PC capability both work. Run the connection checks again after changing networks rather than relying on an old bookmark.
Your questions, answered
Phone companion connection FAQ
What should I check when the phone companion is not connecting?
If the phone companion is not connecting, first open the current PC address on the same trusted LAN. Pair with the current six-digit code within its five-minute window. If the page already opens, investigate pairing or module permissions instead of repeating network changes.
Does my PC also have to use Wi-Fi?
No. A PC using Ethernet and a phone using Wi-Fi can communicate when both are on the same reachable local network. A guest network or router client isolation can prevent that communication even when both devices have internet access. Use the address shown by the PC companion panel.
Why does my pairing code no longer work?
Each six-digit code expires after five minutes and is single-use, with limited failed attempts. A successful pairing issues a fresh code, so use the current displayed code to add another phone while it is valid. Use Try again when offered. If no valid code remains and the panel instructs you to stop and start, choose that deliberately: Stop companion and unpair revokes existing phones too.
Do I need to install a phone app or buy a remote-access service?
Open the companion in your phone browser using the local address displayed on the PC. You can use your existing phone without a dedicated phone app or cloud remote-access service. Keep SysCubes running on the same trusted local network, and visit the download page to install SysCubes for Windows free.
Why is brightness or media missing when the phone is connected?
Check the matching module permission on the PC and any section hidden in the phone layout. A connection does not create a Windows media session or a supported brightness provider. Test the underlying desktop widget too. The current phone snapshot includes only the first three display rows.
Is the local companion connection encrypted?
The current companion uses local HTTP, so use a trusted private network. Pairing controls access but does not turn HTTP into encrypted HTTPS. Avoid forwarding its port to the internet. Use Stop companion and unpair when you want to revoke the saved pairing, rather than only closing the app.
Your PC. In your hands.
Give the phone beside you a useful role.
Confirm one control on the PC, then add the companion sections you use most. Explore phone pairing and current SysCubes Windows release options.
Free • No credit card or account needed • Instant 1-minute setup • Windows 10/11