SQL & PL/SQL

Hi i'm having a problem with setting password for user's in sql plus. I get a ORA-00922 whenever I try to change a user's password to contain ! in it. See below. Do I have to escape special characters or something or this a bug?

(Previously I've always used Enterprise Manager for this and can set ! characters for password without issue but we're currently having an issue with it and I need to alter passwords in sql plus while I'm waiting for it to be fixed )


SQL> alter user lbtest identified by oraclesux!;
alter user lbtest identified by oraclesux!
*
ERROR at line 1:
ORA-00922: missing or invalid option


SQL> alter user lbtest identified by oraclesux;

User altered.

System and O/S details below:

O/S = MS Server 2008 Standard Service Pack 1 64 bit
Oracle 11g Standard Edition (11.1.0.7.0)

SQL> select * from nls_database_parameters;

PARAMETER VALUE
----------------------------------------
NLS_LANGUAGE AMERICAN
NLS_TERRITORY AMERICA
NLS_CURRENCY $
NLS_ISO_CURRENCY AMERICA
NLS_NUMERIC_CHARACTERS .,
NLS_CHARACTERSET WE8MSWIN1252
NLS_CALENDAR GREGORIAN
NLS_DATE_FORMAT DD-MON-RR
NLS_DATE_LANGUAGE AMERICAN
NLS_SORT BINARY
NLS_TIME_FORMAT HH.MI.SSXFF AM

PARAMETER VALUE
----------------------------------------
NLS_TIMESTAMP_FORMAT DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT HH.MI.SSXFF AM TZR
NLS_TIMESTAMP_TZ_FORMAT DD-MON-RR HH.MI.SSXFF AM TZR
NLS_DUAL_CURRENCY $
NLS_COMP BINARY
NLS_LENGTH_SEMANTICS BYTE
NLS_NCHAR_CONV_EXCP FALSE
NLS_NCHAR_CHARACTERSET AL16UTF16
NLS_RDBMS_VERSION 11.1.0.7.0

20 rows selected.