Cisco ASA 5505 - Manual (Page 1658)

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Cisco ASA 5500 Series Configuration Guide using the CLI
Chapter 74 Configuring Clientless SSL VPN
Application Access User Notes
Recovering from hosts File Errors When Using Application Access
The following errors can occur if you do not close the Application Access window properly:
• The next time you try to start Application Access, it might be disabled; you receive a Backup HOSTS
File Found error message.
• The applications themselves might be disabled or might malfunction, even when you are running
them locally.
These errors can result from terminating the Application Access window in any improper way. For
example:
• Your browser crashes while you are using Application Access.
• A power outage or system shutdown occurs while you are using Application Access.
• You minimize the Application Access window while you are working, then shut down your
computer with the window active (but minimized).
This section includes the following topics:
• Understanding the hosts File
• Stopping Application Access Improperly
• Reconfiguring a Host’s File Automatically Using Clientless SSL VPN
• Reconfiguring hosts File Manually
Understanding the hosts File
The hosts file on your local system maps IP addresses to host names. When you start Application Access,
clientless SSL VPN modifies the hosts file, adding clientless SSL VPN-specific entries. Stopping
Application Access by properly closing the Application Access window returns the file to its original
state.
Note Microsoft anti-spyware software blocks changes that the port forwarding Java applet makes to the hosts
file. See
www.microsoft.com for information on how to allow hosts file changes when using
anti-spyware software.
Before invoking Application Access... hosts file is in original state.
When Application Access starts.... • Clientless SSL VPN copies the hosts file to
hosts.webvpn, thus creating a backup.
• Clientless SSL VPN then edits the hosts file,
inserting clientless SSL VPN-specific
information.
When Application Access stops... • Clientless SSL VPN copies the backup file to
the
hosts file, thus restoring the hosts file to
its original state.
• Clientless SSL VPN deletes hosts.webvpn.
After finishing Application Access... hosts file is in original state.