Installing and Troubleshooting Signal Service


Signal Service automatically installs as part of SOTI MobiControl v15.6 or later Management Server (MS), Deployment Server (DS). You cannot opt out from using Signal or installing Signal Service.

Note: The MS and DS connects to the Signal server on TCP port 13131 by default.

In SOTI MobiControl v15.6.0, the rest of the servers detect when there is a designated primary Signal Service and can not run their own independent Signal Service.

In SOTI MobiControl v15.6.1 and later, Signal Service runs in an idle state on servers which do not host the primary Signal Service.

By default, the initial server that the SOTI MobiControl installer (v15.6.0 or later) executes on hosts the primary Signal Service.
Note: In a multi-server environment, it is recommended to install Signal on the server that you use as the DS Device Management Address (DMA).

In SOTI MobiControl v15.6.1 and later, you can change the Signal Service Address, port, and Primary Signal Service designations in the SOTI MobiControl Administration Utility. See Signal Service for more information.

The host environment must have the following components installed to meet the system requirements for Signal:

  • .NET Runtime 6.0
  • ASP.NET Core Runtime 6.0
Note: You can install these components using the ASP.NET Core 6.0 Runtime - Windows Hosting Bundle.

Signal Network Diagram

Below illustrates an example of a multi-server environment with Signal configured.

Signal network example diagram


In SOTI MobiControl v15.6.1 and later, you can use the Administration Utility to:

Most Signal Service issues are a result of the SOTI MobiControl Management Server and Deployment Server not communicating with the Signal server, and can include the following symptoms:

  • Inabilty to view Signal policies in SOTI MobiControl
  • Inabilty to save Signal policies in SOTI MobiControl
  • Expected Signal policy actions do not occur, such as, as shown in the Execution History or Logs tabs of the Signal Policy detailed view
  • Signal connection errors (Exception: Connect - Could not connect to Signal server) appear in the MS and DS log files

Perform the following steps to resolve the connection issue:

  1. Confirm that the Signal Service is running in the Windows Services Manager application. If the service is not running, start it.
  2. Check for errors in the Signal log located at C:\ProgramData\SOTI\Soti.Signal.log. Certificate errors in the log may indicate a configuration problem with the client certificates sent by SOTI MobiControl. You may need to increase the logging level for the Signal Server to get more information. Find the line under logging for Signal in C:\Program Files\SOTI\Signal\appsettings.json and change it to:
    "Soti.Signal": "Debug"
    Note: The logging level is Error by default.

    Restart the Signal service for the changes to take effect.

  3. Error messages indicating "No server certificate found," means there are no certificates are in the Windows Local Computer Personal store that match the Signal Service Address for the configured URL. You may need to install a matching server certificate on the system.
  4. If there are no attempts to connect to Signal, check for routing, DNS, or firewall configurations that may prevent the MS or DS from communicating with the Signal server. The MS and DS connects to the Signal server on TCP port 13131 by default.