telnet to the server on port 1521 from another server, see if you have access On 10/09/2007, Dhimant Patel <drp4kri@xxxxxxxxx> wrote: > > Hi All, > I have recently installed Oracle 11g Enterprise Ed. on redhat EL4, after > installing necessary patches. I have firewall enabled on this server. I also > have disabled SELinux security policy. I have 11g instance running and TNS > names configured. > Attempt to connect to this server fails with ORA-12560 errors. . >