I had some anomalies trying to while run client and designer sessions last evening while working from home via a VPN connection.
My project is pretty simple with a header, left window with tabstrip which swaps out several pages have either historical easy chart trending or a table returned from a query. Each page is swapped out with a tab strip. Opening a trend page, the pens would load, and then the designer or client would freeze and after about 15-30 seconds would disappear. This was repeatable - I was able to reproduce multiple times. I also tried restarting the vision module, the server and the client machine.
At first I thought it query speed. I increased poll rate, but then I read the description that it’s not used for historical trending. Opening the pages with a query being returned to a table didn’t cause the issue. Turning off gateway communication in the designer and navigating around also seemed fine.
When the issues occurred, I didn’t see any errors that seemed relevant. I have some reoccurring opcua endpoint error and some driver timeouts, but these are still occurring today and all seems well here locally (no VPN). Also, looking at which the trends initially populated with data over VPN and locally the speeds were just about identical, maybe about a half second slower over VPN.
Looking at the gateway status after the disappearance it seems the gateway still thought the client existed. In fact, I was able to start another designer, connect and get a lock notice for the window that had been open in the previous designer session. Eventually, the sessions would go away in the gateway monitor, and there is a wrapper log note about closing timed out sessions.
Any clues to what may have been going on?