ORA-27506 ORA-27300 ORA-27301 ORA-27302 ORA-27303 SKGXP IPC libraries must be the same version. [local: UDP,remote: RDS]

Found errors in /u01/app/oracle/admin/*****tst/bdump/alert_*****tst1.log

=====

ORA-27506: IPC error connecting to a port

ORA-27300: OS system dependent operation:proto mismatch failed with status: 0

ORA-27301: OS failure message: Error 0

ORA-27302: failure occurred at: skgxpcon

ORA-27303: additional information: Protocol of this IPC does not match remote (***.***.***.85). SKGXP IPC libraries must be the same version. [local: UDP,remote: RDS]

ORA-27506: IPC error connecting to a port

ORA-27300: OS system dependent operation:proto mismatch failed with status: 0

ORA-27301: OS failure message: Error 0

ORA-27302: failure occurred at: skgxpcon

ORA-27303: additional information: Protocol of this IPC does not match remote (***.***.***.85). SKGXP IPC libraries must be the same version. [local: UDP,remote: RDS]

Errors in file /u01/app/oracle/diag/rdbms/*****tst/*****tst2/trace/*****tst2_lmon_23968.trc

=====

ORA-27550: Target ID protocol check failed. tid vers=1, type=1, remote instance number=1, local instance number=2

LMON (ospid: 23968): terminating the instance due to error 481

LMON caught an error 27550 in the main loop

  

Issue was with 1^st node using UDP and 2^nd Node using RDS. However, both should use UDP. Confirmed this through +ASM1 and +ASM2 alert logs --

+ASM1

+ASM2

Solution - revert back 2^nd node to use UDP instead of RDS (after shutting down database)

Reference -

Oracle Clusterware and RAC Support for RDS over InfiniBand (Doc ID 751343.1)