ORA-12537: TNS:connection closed



 sqlplus 'sys@(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(Host=xyrac02.***.***.*******.com)(Port=1521))(CONNECT_DATA=(SID=xyrac2))) as sysdba'

SQL*Plus: Release 12.2.0.1.0 Production on Fri Nov 11 06:50:24 2022

Copyright (c) 1982, 2016, Oracle.  All rights reserved.

Enter password:
ERROR:
ORA-12537: TNS:connection closed  <<<< 






[oracle@xyrac02 tmp]$ cd $ORACLE_HOME

[oracle@xyrac02 dbhome_1]$ ls -lrt bin/oracle
-rwxrwsr-x 1 oracle oinstall 408898240 Apr 19  2019 bin/oracle

[oracle@xyrac02 dbhome_1]$ chmod 6751 bin/oracle   <<<< change to !!!!!!!!!!!!!!!!!!!

[oracle@xyrac02 dbhome_1]$ ls -lrt bin/oracle
-rwsr-s--x 1 oracle oinstall 408898240 Apr 19  2019 bin/oracle





 tail -100f $ORACLE_BASE/diag/tnslsnr/$(hostname -s)/listener/trace/listener.log

now working !!!!

sqlplus 'sys@(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(Host=xyrac02.***.***.*******.com)(Port=1521))(CONNECT_DATA=(SID=xyrac2))) as sysdba'

SQL*Plus: Release 12.2.0.1.0 Production on Fri Nov 11 06:57:00 2022

Copyright (c) 1982, 2016, Oracle.  All rights reserved.

Enter password:

Connected to:
Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production