FreeTDS and PHP

Hi all,
I'm not sure if this question is best suited for the FreeTDS list, but  
I'm hoping someone on here can help me.

I'm trying to get PHP talking to a MSSQL server through FreeTDS. I can  
connect to the server via both tsql and isql on the host machine where  
PHP is installed, but can't seem to connect via PHP its self with the  
following error appearing:
Warning: odbc_connect() [function.odbc-connect]: SQL error: [unixODBC] 
[FreeTDS][SQL Server]Unable to connect to data source, SQL state S1000  
in SQLConnect in/var/www/html/odbctest.php on line 3

Line 3 (the connection line of the script) is as follows - with  
usernames/passwords removed:
$connect = odbc_connect("DARACW", "username", "pass");

I also get a variety of error messages following this, as a result of  
the $connect variable not being created successfully.

I've looked through logs and things like that, where I would expect to  
find information but haven't found anything as yet. If anyone can  
offer suggestions on what to look at or for it would be appreciated.

Thanks in advance!
James