3Com 3C16630A, User Manual

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Try accessing the device through a different port. If you can now access
the device, a problem with the original port is indicated. Re-examine
the connections and cabling.
Possibly there is a network problem preventing you accessing the
device over the network. Try accessing the device through the serial
port.
Try resetting the device by pressing the reset switch.
You forget your password and cannot log in.
If you are not one of the default users (monitor, manager or security),
another user having security access level can log in, delete your user
name, and create a new user name for you, with a new password.
Alternatively, another user having security access level can log in and
initialize the device, as described in “Initialization” on page 3-49 . This
will return all configuration information, including passwords, to the
initial values.
In the case where no-one knows a password for a security level user,
contact your supplier.