title: Datasnap server authentication problem with remote database of users credentials
body: <p>The situation is: Datasnap client connecting to Datasnap server with his credentials. Authentication procedure starts with server makes a request to remote database which holds users credentials. If credentials matches - all good, authentication is done. But what if remote database is unavailable at this moment? How can i push to client something like "Server is not available at the moment, try again later" while authenticating? Or second case: the user is blocked (to realize this we need to access database too) and i want to tell him a reason why he can't access to service? I was googling this issue, but i still don't understand the right way to do it.</p>
  
  <p>Any tip can be helpful, thanks in advance and have a nice day!</p>