Failed to create DataTypeDictionary

Greetings, we have a problem when we restart some of our servers. It takes a long time before opc tags become valid.
We are still looking into the issue but are wondering if the error below could have something to do with it.

Any insights?

Not sure if this is the cause of your delay, but on the servers where that fails the client would not be able to decode structured values defined by that dictionary.

If you search for that logger and turn it to DEBUG level you can probably figure out how long it's taking for each server. It only gets read when the connection is made, so you'd have to edit/save to force a reconnect.