Dear Sir,
I want to know what precautions have to be taken when I close my OPC UA client application which is connected to a third party OPC UA Server? My client subscribes to some nodes on server and performs some browse/read/write operation. The shutdown scenerios are as follows:

1. Client remains conencted indefinitely. The client /server laptop may go to hybernate mode and come alive in any squence. Will the protocol take care of dsconnecting and restoring the connection appropriately?
2. If the client application is terminated by user abruptly by deleting the window , then what happens to the server (third party, not PROSYS’s server)? Will the subscriptions on server get deleted/garbage collected by the server automatically? Will repeated restart of the client lead to memory leaks in the server. (I see that the subscription ID keeps incrementing every time we restart the client, until we restert the server). Hope the client shuts down after disconnecting from server gracefully?
3. If user exits the client application thru proper selection of exit option, then what precautions do we have to take in our application to shutdown gracefully from the server? (What calls do we have to make to the server to disconnect from it gracefully)?
4. Are there any situations that can cause the cleint application to shutdown or crash the server? What precuations should we take to avoid such situation especially in a running plant the servr crash or restart could be disasterous!

Best Reagrds
PRAMANJ