Redo log shipping is not happening from primary to standby properly

Hi all,

We are using oracle database EE 19.15.0.0 as primary and standby, where primary is in RAC. Standby database is not in sync throwing below errors in primary and standby.

Primary

*******

Fatal NI connect error 12170.

VERSION INFORMATION:
TNS for Linux: Version 19.0.0.0.0 - Production
Oracle Bequeath NT Protocol Adapter for Linux: Version 19.0.0.0.0 - Production
TCP/IP NT Protocol Adapter for Linux: Version 19.0.0.0.0 - Production
Version 19.15.0.0.0
Time: 03-JUN-2024 14:36:55
Tracing not turned on.
Tns error struct:
ns main err code: 12535

TNS-12535: TNS:operation timed out
ns secondary err code: 12608
nt main err code: 0
nt secondary err code: 0
nt OS err code: 0
Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=10.8.7.24)(PORT=1545))