Cisco FirePOWER ASA 5500 series User Manual

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Cisco Security Appliance Command Line Configuration Guide
OL-10088-01
Chapter 37 Configuring WebVPN
Configuring Application Access
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 hosts File
Understanding the hosts File
The hosts file on your local system maps IP addresses to host names. When you start Application Access,
WebVPN modifies the hosts file, adding WebVPN-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....
• WebVPN copies the hosts file to
hosts.webvpn, thus creating a backup.
• WebVPN then edits the hosts file, inserting
WebVPN-specific information.
When Application Access stops...
• WebVPN copies the backup file to the hosts
file, thus restoring the hosts file to its original
state.
• WebVPN deletes hosts.webvpn.
After finishing Application Access... hosts file is in original state.

Cisco FirePOWER ASA 5500 series Specifications

General

Brand	Cisco
Model	FirePOWER ASA 5500 series
Category	Firewall
Language	English