May 4, 2021

Survey Solutions server administrator has access to the special healthcheck page using the following: menuAdministrationDiagnostics.

This page may appear like the following:

This page shows two kinds of information:

  • left side shows diagnostics related to server configuration, whether the settings are set up correctly and the different components are able to talk to each other;

  • right side shows various metrics of the server performance, such as the CPU load, memory usage, number of concurrent queries, or the database footprint.

Server administrators are requested to inspect the indications of this panel for common problems before bringing them up to the support.

Under proper configuration all components at the left side should be green. The number of broken packages may become positive due to miscoordination between the interviewers and supervisors (e.g. the same interview rejected to two different interviewers) even under normal work.

The following can be the statuses for the healthcheck:

  • Healthy (green) - export service is responding and can access headquarters;
  • Degraded (yellow) - export service is not answering;
  • Unhealthy (red) - export service cannot access headquarters;

The healthcheck status is available for monitoring remotely (without authorization) at the following URL:

For example, for the publicly available demo server the healthcheck status URL is:

The response contains exactly one word: “Healthy”, “Degraded”, or “Unhealthy”.

The healthcheck diagnostics tool has been added in version 20.07 of Survey Solutions.

WebSocket connectivity check

Following the server metrics the healthcheck page shows the process of testing the WebSocket connectivity. Under the normal operation the user should observe a sequence of PING and PONG messages with an interval of about 1-3 seconds. If only PING messages are observed and no PONG responses are received, then the server is experiencing a disruption in the WebSocket connectivity. This connectivity is necessary for SignalR, which is utilized in Survey Solutions to conduct web interviews and allow the supervisors/HQ-users to review the interviews on the server.

The WebSockets test is only informative if ran from an external network (from the internet). When run directly on the server it will indicate availability of WebSockets, yet the real user experience may be different.

Note also that the PING-PONG communication here may indicate that a response has been received, but not over the WebSockets, but rather using LongPolling. This is not sufficient for Survey Solutions. Make sure the test succeeds in communication specifically over WebSockets.