https://community.hpe.com/t5/operating-system-linux/cannot-use-port-1521-for-oracle/m-p/2979453#M4823 Use #netstat -a to see if port 1521 is open, then tcpdump port 1521 to listent ot what happens when trying to connect.<BR />If this port is closed, then check your Oracle configuration.<BR />hth<BR />J<BR /> Thu, 22 May 2003 05:45:11 GMT Jerome Henry 2003-05-22T05:45:11Z https://community.hpe.com/t5/operating-system-linux/cannot-use-port-1521-for-oracle/m-p/2979452#M4822 I have setup SuSE8, installed Oracle. From remote PC I can telnet and ftp to this Linux server, but I cannot use SQL*Net to connect to the Oracle database, which is using port 1521.<BR /><BR />I have shutdown the fire wall, but no hpe !<BR /><BR />Please advice. Thanks Thu, 22 May 2003 05:32:49 GMT https://community.hpe.com/t5/operating-system-linux/cannot-use-port-1521-for-oracle/m-p/2979452#M4822 Pham Quoc Trung 2003-05-22T05:32:49Z https://community.hpe.com/t5/operating-system-linux/cannot-use-port-1521-for-oracle/m-p/2979453#M4823 Use #netstat -a to see if port 1521 is open, then tcpdump port 1521 to listent ot what happens when trying to connect.<BR />If this port is closed, then check your Oracle configuration.<BR />hth<BR />J<BR /> Thu, 22 May 2003 05:45:11 GMT https://community.hpe.com/t5/operating-system-linux/cannot-use-port-1521-for-oracle/m-p/2979453#M4823 Jerome Henry 2003-05-22T05:45:11Z https://community.hpe.com/t5/operating-system-linux/cannot-use-port-1521-for-oracle/m-p/2979454#M4824 use lsof or netstat and see if the listner is actully running on port 1521.<BR /><BR />-balaji Thu, 22 May 2003 05:47:21 GMT https://community.hpe.com/t5/operating-system-linux/cannot-use-port-1521-for-oracle/m-p/2979454#M4824 Balaji N 2003-05-22T05:47:21Z