DRESS=(PROTOCOL=TCP)(HOST=taia
n-pt-d2-vip)(PORT=1521))))
remote_listener string pdpt-cluster-scan:1521
经Metalink上查找，发现这是11.2.0.1的小bug：“ORA-12545 or ORA-12537 while connecting to RAC through SCAN name[ID 970619.1]”，11.2.0.2及之后的版本就修复好了
Client is able to resolve all Fully Qualified Domain Name (FQDN) SCAN and VIP name but not short ones(without domain name) as its in different domain; even though FQDN names were specified during Grid Infrastructure setup, due to bug 9150053 by default DBCA set database parameter local_listener to short node VIP name while database is created.
因此只要把数据库实例参数local_listener内的host改为vip的IP地址即可。
NODE1：
SQL> alter system set local_listener='(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=210.10.4.9)(PORT=1521))))' scope=both sid='PDPT1';
System altered.
SQL> alter system register;
System altered.
NODE2：
SQL> alter system set local_listener='(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=210.10.4.10)(PORT=1521))))' scope=both sid='PDPT2';
System altered.
SQL> alter system register;
System altered.
参考：How to Troubleshoot Connectivity Issue with 11gR2 SCAN Name [ID 975457.1]
ORA-12545 or ORA-12537 while connecting to RAC through SCAN name[ID 970619.1]
11.2 Scan and Node TNS Listener Setup Examples [ID 1070607.1]