双方远程连接均无问题。在为rac的主库搭建备库时，跑dup报错，报错信息如下，主库trc文件请看附件：

Starting Duplicate Db at 28-MAY-19

contents of Memory Script:
{
   backup as copy reuse
   passwordfile auxiliary format  '/u01/app/oracle/product/12.1.0/dbhome_1/dbs/orapwebsdg'   ;
}
executing Memory Script

Starting backup at 28-MAY-19
released channel: c1
released channel: c2
released channel: c3
released channel: c4
released channel: c5
released channel: c6
released channel: c7
released channel: c8
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 05/28/2019 15:15:11
RMAN-05501: aborting duplication of target database
RMAN-03015: error occurred in stored script Memory Script
RMAN-03009: failure of backup command on c1 channel at 05/28/2019 15:15:11
ORA-17629: Cannot connect to the remote database server
ORA-17628: Oracle error 17630 returned by remote Oracle server
ORA-17630: Mismatch in the remote file protocol version client  server