Problems setting up a datasource from CF9 to MySQL 5.1

[JaneUK]

I have a MySQL database sitting on a Windows server (yes, Windows, not any variety of Unix). The same server also runs CF9, and a lot of websites as a result, and all of this is working happily.

A few months ago, I set up the PC on my desk to run CF9, so I could use it for development purposes. I set up datasources to my MySQL database, using the MySQL (4/5) driver, and once I'd opened up the firewall on the server to let port 3306 through, again all was well.

Now I have a new desktop PC. I'm trying to do the same thing.  If I try to set up a datasource, I get

Connection verification failed for data source: myDSNname
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
The root cause was that: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.

Unfortunately, I can't remember what else I might have done on my previous desktop PC to get this working, and it's now being used by a colleague, so I can't spend much time on it investigating: a quick look showed nothing abnormal.

If I Telnet the server, I can get a reply as long as I specify the port, and a look at the firewall tells me that that port is open for all IPs, so I don't think it's a firewall/IP problem.

I don't know much about MySQL, and anything I Google assumes I'm on a Unix server for some reason. Could there be a MySQL setting that's restricting the IP address?

Is there something in CF9 Admin I need to set? I installed with the defaults.

I've tried the alternative driver specifed in this tech note, and got the same result.

Edit: it occurs to me that one known difference between old PC and new PC is that I used to have admin rights on my account, and on the new PC, I don't. I can log on as admin if I need to, and did to install CF, but I don't haev those rights by default. I can't imagine how this would change anything, but thought I'd mention it.

[Swift]

Sounds like a permissions issue. What account is your CF9 running under? Check services.msc to see.

Is it LocalSystem? Does the account it is running under have access to the db server?

Swift

[JaneUK]

It's running under Local System. Let me check the previous PC, since that will only take the new user a moment... that, too, is running under Local System.

I don't know how to check if that has access to the DB server.

[JaneUK]

OK, problem found, and bypassed.

In MySQL, the root account had been set up to only talk to localhost.

I've created a new account, given it access to the DB I need (and nothing else), and used it - all is well.

I have no idea why the account I was using on my old PC failed to work on this one, but password typos seem likely.