User dialog - How to state clearly username isn't found, and unable to connect to server?

Question

An app I'm working on has an "offline mode" - as it is frequently used in environments where mobile data is unavailable. When they're connected to the internet and login to an account, that account has offline information stored to the device so it can be logged into when the have no internet access.

The users of the app are park rangers and inspectors, so I want to make sure the language used is clear as it might show whilst they're doing their job in the field and won't be able to call anyone.

The purpose of the error messsage is to show:

When their username isn't found on the device and can't connect to the server to check for new users.

This is currently what I've got:

Username not found and unable to connect to server. Confirm username is correct or ensure server is connected to check for new user accounts.

Although I'm unsure if this is clear enough to be usable (not to mention long winded).

Answer 1

I usually advise being as upfront with the user as their technical abilities allow. Presumably, they understand a few things about this app and software in general:

1. Login is required
2. A connection is typically necessary
3. This app features a special mode to allow offline use.

Given that, I'd go with some kind of message that notes the issue, then explains the reasons, even if wordy.

Login Failed

First-time logins require internet access. Verify your username and internet connection.

My thinking is that the user can decide if this really is a "first-time login" and make the appropriate judgment about which issue (connection or username) is the likely culprit.