请问备库这个Service "rac" has 1 instance(s). Instance "stbrac1", status BLOCKED, has 1 handler(s) for this service...是哪里来的？

问题背景

已经将rac to rac的dataguard搭建好了。然后将备库中的数据文件、控制文件、pfile、spfile全部清理掉重新搭建，出现了下面的问题。

报错信息

[oracle@stb-rac1 dbs]$ rman TARGET sys/xxx@rac AUXILIARY sys/xxx@stbrac

Recovery Manager: Release 12.2.0.1.0 - Production on Wed Dec 1 13:57:09 2021

Copyright (c) 1982, 2017, Oracle and/or its affiliates.  All rights reserved.

connected to target database: RAC (DBID=2677927145)
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00554: initialization of internal recovery manager package failed
RMAN-04006: error from auxiliary database: ORA-12537: TNS:connection closed

截图

备库信息

[grid@stb-rac1 admin]$ cat $ORACLE_HOME/network/admin/listener.ora
LISTENER_SCAN1=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN1))))                # line added by Agent
MGMTLSNR=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=MGMTLSNR))))            # line added by Agent
LISTENER=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER))))            # line added by Agent
ASMNET1LSNR_ASM=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=ASMNET1LSNR_ASM))))              # line added by Agent

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME = stbrac)
      (ORACLE_HOME = /u01/app/oracle/product/12.2.0/dbhome_1)
      (SID_NAME = stbrac1)
    )
  )

ENABLE_GLOBAL_DYNAMIC_ENDPOINT_ASMNET1LSNR_ASM=ON               # line added by Agent
VALID_NODE_CHECKING_REGISTRATION_ASMNET1LSNR_ASM=SUBNET         # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER=ON              # line added by Agent
VALID_NODE_CHECKING_REGISTRATION_LISTENER=SUBNET                # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_MGMTLSNR=ON              # line added by Agent
VALID_NODE_CHECKING_REGISTRATION_MGMTLSNR=SUBNET                # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN1=ON                # line added by Agent
VALID_NODE_CHECKING_REGISTRATION_LISTENER_SCAN1=OFF             # line added by Agent
[grid@stb-rac1 admin]$ lsnrctl status

LSNRCTL for Linux: Version 12.2.0.1.0 - Production on 01-DEC-2021 13:54:39

Copyright (c) 1991, 2016, Oracle.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 12.2.0.1.0 - Production
Start Date                01-DEC-2021 13:47:10
Uptime                    0 days 0 hr. 7 min. 28 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/12.2.0/grid/network/admin/listener.ora
Listener Log File         /u01/app/grid/diag/tnslsnr/stb-rac1/listener/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.2.92)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.2.93)(PORT=1521)))
Services Summary...
Service "+ASM" has 1 instance(s).
  Instance "+ASM1", status READY, has 1 handler(s) for this service...
Service "+ASM_DATA" has 1 instance(s).
  Instance "+ASM1", status READY, has 1 handler(s) for this service...
Service "+ASM_OCR" has 1 instance(s).
  Instance "+ASM1", status READY, has 1 handler(s) for this service...
Service "rac" has 1 instance(s).
  Instance "stbrac1", status BLOCKED, has 1 handler(s) for this service...
Service "stbrac" has 1 instance(s).
  Instance "stbrac1", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
[grid@stb-rac1 admin]$ su - oracle
Password: 
Last login: Wed Dec  1 13:45:39 EST 2021 on pts/1
[oracle@stb-rac1 ~]$ cat $ORACLE_HOME/network/admin/tnsnames.ora 
# tnsnames.ora Network Configuration File: /u01/app/oracle/product/12.2.0/dbhome_1/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.

RAC =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = scan-cluster)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = rac)
    )
  )


stbrac =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = stb-rac1)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = stbrac)(UR=A)
    )
  )

[oracle@stb-rac1 ~]$