Adaptive Server is unavailable or does not exist error connecting to SQL Server from PHP

Question

I m attempting to connect to a SQL Server 2005 DB from my Mac using unixODBC and FreeTDS as I have outlined here  However  when I try to connect in to a different DB using the same setup  I get   Connection Failed  FreeTDS  SQL Server Unable to connect  Adaptive Server is unavailable or does not exist    Here is my freetds conf setup    my db  host   12 34 56 789 port   1433 tds version   8 0   And here is my odbc ini    my dsn  Driver    opt local lib libtdsodbc so Description   My Database Trace   no Servername   my db Database   MyDB   ODBC Data Sources  my dsn   FreeTDS   I am still able to connect to the other DB I set up on this computer  described in my blog post linked above   so I m pretty sure that the error isn t on the Mac end  I ve verified on the server that I m using the correct IP address and port  Any thoughts on what could be the problem  and if it s on the server end

User · Answer

1  See information about the SQL server  tsql -LH SERVER IP ADDRESS  locale is  C  locale charset is  646  ServerName TITAN InstanceName MSSQLSERVER IsClustered No Version 8 00 194 tcp 1433 np   TITAN pipe sql query   2  Set your freetds conf  tsql -C     freetds conf directory   usr local etc   TITAN  host   SERVER IP ADDRESS port   1433 tds version   7 2   3 Try  tsql -S TITAN -U user -P password   OR     dsn    gt   dblib host TITAN 1433 dbname YOURDBNAME     See also http   www freetds org userguide confirminstall htm  Example 3-5       If you get message 20009  remember you haven t connected to the machine  It s a configuration or network issue  not a protocol failure  Verify the server is up  has the name and IP address FreeTDS is using  and is listening to the configured port

User · Answer

Bud  disable selinux or add the following to your RedHat CentOS Server   setsebool -P httpd can network connect db 1 setsebool -P httpd can network connect 1   Best always

User · Answer

After countless hours of frustration I managed to get all working   odbcinst ini    FreeTDS  Description   FreeTDS Driver v0 91 Driver    usr lib x86 64-linux-gnu odbc libtdsodbc so Setup    usr lib x86 64-linux-gnu odbc libtdsS so fileusage 1 dontdlclose 1 UsageCount 1   odbc ini    test  Driver   FreeTDS Description   My Test Server Trace   No  TraceFile    tmp sql log ServerName   mssql  Port   1433 instance   SQLEXPRESS Database   usedbname TDS Version   4 2   FreeTDS conf    mssql  host   hostnameOrIP instance   SQLEXPRESS  Port   1433 tds version   4 2   First test connection  mssql is a section name from freetds conf    tsql -S mssql -U username -P password   You must see some settings but no errors and only a 1  prompt  Use quit to exit   Then let s test DSN FreeTDS  test is a section name from odbc ini  -v means verbose    isql -v test username password -v   You must see message Connected

User · Answer

Try changing server name to  localhost   pymssql connect server  localhost   user  myusername   password  mypwd   database  temp  port  1433

User · Answer

Responding because this answer came up first for search when I was having the same issue       08S01  unixODBC  FreeTDS  SQL Server Unable to connect  Adaptive Server is unavailable or does not exist   MSSQL named instances have to be configured properly without setting the port   documentation on the freetds config says set instance or port NOT BOTH   freetds conf   Name  host   Server com instance   instance name  port   port is found automatically  don t define explicitly tds version   8 0 client charset   UTF-8   And in odbc ini just because you can set Port  DON T when you are using a named instance

User · Answer

I had the same issue  my problem was that the firewall on the server wasn t open from the current ip address

User · Answer

It sounds like you have a problem with your dsn or odbc data source   Try bypassing the dsn first and connect using   TDSVER 8 0 tsql -S  serverIPAddress  -U  username  -P  password    If that works  you know its an issue with your dsn or with freetds using your dsn  Also  it is possible that your tds version is not compatible with your server  You might want to try other TDSVER settings  5 0  7 0  7 1

User · Answer

I ve found an issue happen to be with the Firewall  So  make sure your IP is whitelisted and the firewall does not block your connection  You can check connectivity with   tsql -H somehost com -p 1433   In my case  the output was   Error 20009  severity 9     Unable to connect  Adaptive Server is unavailable or does not exist   OS error 111   Connection refused  There was a problem connecting to the server

[php] "Adaptive Server is unavailable or does not exist" error connecting to SQL Server from PHP

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