dgmgrl switchover or convert gives ORA-01017

I have this setup of dataguard with broker:

Host:     paris.localdomain

Instance: TESTDB  (primary)

Host:     london.localdomain

Instance: TESTDBS (physical standby)

When I do:

dgmgrl /

DGMGRL> show configuration;

It all seems fine.

Errors on switchover

If I do a switchover, I get the following errors:

DGMGRL> switchover to 'TESTDBS';
Performing switchover NOW, please wait...
Operation requires a connection to instance "TESTDBS" on database "TESTDBS"
Connecting to instance "TESTDBS"...
ORA-01017: invalid username/password; logon denied

Warning: You are no longer connected to ORACLE.

    connect to instance "TESTDBS" of database "TESTDBS"

DGMGRL>       

Errors on convert command

Also, when I do a convert to snapshot standby, it works fine, but back to physical standby fails:

DGMGRL> convert database 'TESTDBS' to snapshot standby;
Converting database "TESTDBS" to a Snapshot Standby database, please wait...
Database "TESTDBS" converted successfully
DGMGRL> show configuration;

Configuration - DRSolution

  Protection Mode: MaxPerformance
  Databases:
    TESTDB  - Primary database
    TESTDBS - Snapshot standby database

Fast-Start Failover: DISABLED

Configuration Status:
SUCCESS

DGMGRL> convert database 'TESTDBS' to physical standby;
Converting database "TESTDBS" to a Physical Standby database, please wait...
Operation requires shutdown of instance "TESTDBS" on database "TESTDBS"
Shutting down instance "TESTDBS"...
ORA-01017: invalid username/password; logon denied

Warning: You are no longer connected to ORACLE.

Please complete the following steps and reissue the CONVERT command:
    shut down instance "TESTDBS" of database "TESTDBS"
    start up and mount instance "TESTDBS" of database "TESTDBS"

DGMGRL>

This leads to a lot of manual work, which is not nice - certainly not in times of emergency.

Solution

Note, that when you do such operations, you should login without the slash:

[oracle@paris ~]$ dgmgrl
DGMGRL for Linux: Version 11.2.0.4.0 - 64bit Production

Copyright (c) 2000, 2009, Oracle. All rights reserved.

Welcome to DGMGRL, type "help" for information.
DGMGRL> connect sys
Password: ******
Connected.
DGMGRL>
 
The password is explicitly needed!! 
So do NOT use dgmgrl / for these operations.

This took me a few hours to find out, hope to never forget it anymore.

Documentation
The documentation that I should have read is:
http://docs.oracle.com/cd/B28359_01/server.111/b28295/dgmgrl.htm#BABHECFB and then under 8.1.1 the phrase:

       (remote database restarts will not work),

How could I have missed that....