网上找的，不过可以。

于是查找了一下资料，密码过期导致EM无法登录。ORACLE11G默认的口令期限是180天，为了永久解决这个问题只能修改配置文件。
1、查看目前数据库中的口令期限
SYS@ orcl>select * from dba_profiles where profile='DEFAULT'
  2  and resource_name='PASSWORD_LIFE_TIME';
PROFILE                        RESOURCE_NAME                    RESOURCE         LIMIT
------------------------------ -------------------------------- ------------------------------------------------
DEFAULT                        PASSWORD_LIFE_TIME               PASSWORD    180
 
2、修改成无限制的

SYS@ orcl>alter profile default limit password_life_time unlimited;
3、查看em的两个账号状态sysman和dbsnmp
SYS@ orcl>select username,account_status from dba_users;
USERNAME                       ACCOUNT_STATUS
------------------------------ --------------------------------
TEST                           OPEN
TEST2                          OPEN
SCOTT                          OPEN
HR                             OPEN
ORACLE_OCM                     EXPIRED & LOCKED
XS$NULL                        EXPIRED & LOCKED
BI                             EXPIRED & LOCKED
PM                             EXPIRED & LOCKED
MDDATA                         EXPIRED & LOCKED
IX                             EXPIRED & LOCKED
SH                             EXPIRED & LOCKED
USERNAME                       ACCOUNT_STATUS
------------------------------ --------------------------------
DIP                            EXPIRED & LOCKED
OE                             EXPIRED & LOCKED
APEX_PUBLIC_USER               EXPIRED & LOCKED
SPATIAL_CSW_ADMIN_USR          EXPIRED & LOCKED
SPATIAL_WFS_ADMIN_USR          EXPIRED & LOCKED
DBSNMP                         EXPIRED
SYSMAN                         EXPIRED
4、2个账号都过期，于是修改密码
SYS@ orcl>alter user dbsnmp identified by oracle;
User altered.
SYS@ orcl>alter user sysman identified by oracle;
User altered.
 
5、再重新打开EM，能够正常使用了。在修改密码前我重新启动过数据库和EM

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