> For the complete documentation index, see [llms.txt](https://docs.monokot.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.monokot.io/tags-and-devices/opc-ua-connectivity/diagnostics.md).

# Diagnostics

In addition to diagnostic variables described [<mark style="color:blue;">here</mark>](/tags-and-devices/devices/diagnostics.md), OPC UA Client provides the *LastKeepAliveUtcTime* property. It contains the time of the last successful check of connection with the server in UTC.