Mapfile connection string for postgis

[rock well]

Hello all i was trying to connect postgis remote database from mapserver, so i included a connection string in the mapfile as 
   
  CONNECTIONTYPE POSTGIS 
CONNECTION "host=remoteserverhostname user=postgres password=random1 dbname=tes port=5432"
DATA "* from tablename"
   
  but this gives me the following errors
   
  Warning: [MapServer Error]: msPOSTGISLayerOpen(): couldnt make connection to DB with connect string 
  Error reported was 'FATAL: Ident authentication failed for user "postgres" '. 
This error occured when trying to make a connection to the specified postgresql server. 

  I dont know if the connection string is right or not, or do we have to change anything in the configuration file for postgresql .....
   
  Thanks for your time and appreciate it .......
  kris

		
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