SSO logon not possible; browser logon ticket cannot be accepted

What causes this issue?

The logon ticket sent from the browser has not been accepted on this
server.
A logon ticket already exists, which means a MYSAPSSO2 cookie is sent
from the Web browser to the server. This cookie however is not accepted
by the server.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

A logon ticket has a limited validity period. If this time has expired,
this error occurs. To fix the error close the browser window and restart
the Web browser.
The error may also occur if the ticket was issued by a different server
that is in the same domain but is not configured to accept these
tickets.
For more information see the SAP Libary under the Internet address
help.sap.com/nw2004s -> <ZK>SAP NetWeaver -> Security -> User
Authentication and Single Sign-On-> Authentication onthe SAP NetWeaver
Application Server ABAP -> Using Logon Tickets -> Configuring the System
for Accepting Logon Tickets.</>

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.