# Open ORACLE_HOME/network/admin/listener.ora in your favorite
# text editor (vi on Unix, Notepad on Windows, for example).
# In the address list with PROTOCOL=TCP, change the PORT number
# back from 1526 to the default 1521 (which used to be the default port
# number on older versions of Oracle.)  Save and exit.
# Restart the listener:

lsnrctl stop
lsnrctl start

# Open ORACLE_HOME/network/admin/tnsnames.ora in your favorite
# text editor (vi on Unix, Notepad on Windows, for example).
# In the entry for your instance, in the DESCRIPTION's ADDRESS
# for PROTOCOL=TCP, change the PORT number back from 1526
# to the default 1521.  Save and exit.
# Test with tnsping (or SQL*Plus).

tnsping SID

