"Unexpected EOF from the server"

Hello all,
I am setting up freetds on an OS X Server (10.5.8) in order to use PHP to
connect to a SQL 2005 server. I have been moderately successful, and can
connect successfully using tsql. However, when I use PHP, I cannot connect
to my MSSQL server. When I try to connect, the freetds.log file shows:

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12:27:38.122049 13379 (log.c:190):Starting log file for FreeTDS 0.82
on 2009-09-03 12:27:38 with debug flags 0xffff.
12:27:38.122112 13379 (iconv.c:363):iconv to convert client-side data to the
"ISO-8859-1" character set
12:27:38.122222 13379 (iconv.c:516):tds_iconv_info_init: converting
"ISO-8859-1"->"UCS-2LE"
12:27:38.122260 13379 (iconv.c:516):tds_iconv_info_init: converting
"ISO-8859-1"->"UCS-2LE"
12:27:38.122283 13379 (net.c:210):Connecting to 141.110.7.72 port 1433 (TDS
version 8.0)
12:27:38.122391 13379 (net.c:264):tds_open_socket: connect(2) returned
"Operation now in progress"
12:27:38.123094 13379 (net.c:303):tds_open_socket() succeeded
12:27:38.123123 13379 (util.c:162):Changed query state from DEAD to IDLE
12:27:38.123139 13379 (login.c:735):quietly sending TDS 7+ login packet
12:27:38.123256 13379 (token.c:312):tds_process_login_tokens()
12:27:38.124685 13379 (util.c:334):tdserror(0x102f283d0, 0x102f2f0b0, 20017,
0)
12:27:38.124726 13379 (dblib.c:7782):dbperror(0x100972200, 20017, 0)
12:27:38.124756 13379 (dblib.c:7835):20017: "Unexpected EOF from the server"
12:27:38.124772 13379 (dblib.c:7856):"Unexpected EOF from the server",
client returns 2 (INT_CANCEL)
12:27:38.124789 13379 (util.c:368):tdserror: client library returned
TDS_INT_CANCEL(2)
12:27:38.124803 13379 (util.c:389):tdserror: returning TDS_INT_CANCEL(2)
12:27:38.124865 13379 (util.c:162):Changed query state from IDLE to DEAD
12:27:38.124885 13379 (token.c:316):looking for login token, got  0()
12:27:38.124903 13379 (token.c:108):tds_process_default_tokens() marker is
0()
12:27:38.124917 13379 (token.c:111):leaving tds_process_default_tokens()
connection dead
12:27:38.124930 13379 (util.c:334):tdserror(0x102f283d0, 0x102f2f0b0, 20002,
0)
12:27:38.124945 13379 (dblib.c:7782):dbperror(0x100972200, 20002, 0)
12:27:38.124961 13379 (dblib.c:7835):20002: "Adaptive Server connection
failed"
12:27:38.124989 13379 (dblib.c:7856):"Adaptive Server connection failed",
client returns 2 (INT_CANCEL)
12:27:38.125003 13379 (util.c:368):tdserror: client library returned
TDS_INT_CANCEL(2)
12:27:38.125016 13379 (util.c:389):tdserror: returning TDS_INT_CANCEL(2)
12:27:38.125036 13379 (dblib.c:1372):dbclose(0x100972200)
12:27:38.125051 13379 (dblib.c:256):dblib_del_connection(0x102bd4b00,
0x102f2f0b0)
12:27:38.125209 13379 (mem.c:563):tds_free_all_results()
12:27:38.125237 13379 (dblib.c:303):dblib_release_tds_ctx(1)
12:27:38.125273 13379 (dblib.c:5727):dbfreebuf(0x100972200)
12:27:38.125372 13379 (dblib.c:718):dbloginfree(0x102f2ed50)

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My freetds.conf file looks like this:

**********************
#   $Id: freetds.conf,v 1.12 2007/12/25 06:02:36 jklowden Exp $
#
# This file is installed by FreeTDS if no file by the same
# name is found in the installation directory.
#
# For information about the layout of this file and its settings,
# see the freetds.conf manpage "man freetds.conf".

# Global settings are overridden by those in a database
# server specific section
[global]
        # TDS protocol version
tds version = 8.0

# Whether to write a TDSDUMP file for diagnostic purposes
# (setting this to /tmp is insecure on a multi-user system)
dump file = /tmp/freetds.log
debug flags = 0xffff

# Command and connection timeouts
;timeout = 10
;connect timeout = 10
 # If you get out-of-memory errors, it may mean that your client
# is trying to allocate a huge buffer for a TEXT field.
# Try setting 'text size' to a more reasonable limit
text size = 64512

# A typical Sybase server
[egServer50]
host = symachine.domain.com
port = 5000
tds version = 5.0

# A typical Microsoft server
[egServer70]
host = ntmachine.domain.com
port = 1433
tds version = 7.0

#AC501
[ac501]
host = ac-501.acad.tri-c.edu
port = 1433
tds version = 8.0

***********************


My PHP script look like this:

***********************

<?php

putenv("FREETDSCONF=/usr/local/php5/etc/freetds.conf");

$link = mssql_connect("ac501","sa","*hidden*") or die(error);

?>

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Thank you,

Nikhil Chand