Crystal Reports Logging in Issues at runtime for one machine

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VB

I have what I thought would be a simple problem but I am getting stumped on a resolution.

I have an App that uses Visual Studio Crystal Reports to display some information.

but all of a sudden one machine is now asking for username and password but server name and database is greyed out.

I have tried manually inputting his username and password but it fails.

Logon information has been passed through the application as shown below

LogOnConn = New ConnectionInfo()
LogOnConn.ServerName = ServerName
LogOnConn.DatabaseName = DatabaseName
LogOnConn.IntegratedSecurity = IntegratedSecurity

What I've done

1. Restarted the machine to see if it was a network connection issue
2. Un installed and re installed the application
3. Re installed Crystal Reports
4. Tried logging in as someone else on the machine in question and the problem still exists, so it can't be a user issue
5. Logged in as the user affected on a different machine and it works as expected

I have googled and so far it only shows that you need to pass the information through the application which I am currently doing.

Thanks
Simon