RMAN Active duplicate hung with ORA-12792: Network transfer operation aborted due to TTC error 12543

KB160250

Creation of standby using RMAN active duplicate hung with below errors seen on primary alert log :

2024-03-23T04:45:47.593662-04:00

Errors in file /u01/app/oracle/diag/rdbms/test_shk_iad/test/trace/test_ora_65670.trc:

ORA-12792: Network transfer operation aborted due to TTC error 12543.

2024-03-23T04:48:35.527422-04:00

Please follow below action plan to modify the iptables on both primary & standby and retry the active duplicate :

1.) Save iptables

sudo su -

iptables-save > /home/oracle/iptables.orig

2.) List iptables

iptables -L --line-numbers

3.) Delete following lines from below chains :

Chain INPUT (policy ACCEPT)

12 REJECT all -- anywhere anywhere reject-with icmp-host-prohibited

Chain FORWARD (policy ACCEPT)

1 REJECT all -- anywhere anywhere reject-with icmp-host-prohibited

4.) Below commands will be used for deletion :

iptables -D INPUT <number from first col from above output belonging to the reject-with icmp-host-prohibited >

iptables -D FORWARD <number from first col from above output belonging to the reject-with icmp-host-prohibited >

Example :

iptables -D INPUT 12

iptables -D FORWARD 1

4.) Verify if rules have been deleted :

iptables -L --line-numbers

5.) Retry the creation of standby.

6.) Below step to restore should be done only after standby is created.

Restore the default rules:

iptables-restore /tmp/iptables.orig

Reload and check if the previous rules are as a default

systemctl reload iptables.service

systemctl status iptables.service

Attachments :

This is known issue in DB System and this was being investigated in below mentioned bug by Development :

Bug 35470978 - ORCHESTRATIONS WHERE RMAN IS INVOLVED ARE FAILING WITH ORA-12792: NETWORK TRANSFER OPERATION ABORTED DUE TO TTC E

But bug got closed since issue was resolved with the workaround as mentioned below after which customer didn't comeback.