Cisco Cisco IOS Software Release 12.4(6)T

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SSL VPN
  Restrictions for SSL VPN
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Cisco IOS Security Configuration Guide
The SSL VPN gateway and context configuration must be completed before a remote user can access 
resources on a private network behind an SSL VPN. This configuration is shown in the section “
ACL Support
Before configuring this feature, the time range should have already been configured.
Single SignOn (SSO) Netegrity Cookie Support
A Cisco plug-in must be installed on a Netegrity SiteMinder server.
Restrictions for SSL VPN 
URLs referred by the Macromedia Flash player cannot be modified for secure retrieval by the SSL 
VPN gateway.
Cisco AnyConnect VPN Client
CiscoAnyConnect VPN Client does not support the following:
Datagram Transport Layer Security (DTLS) with SSL connections
Standalone Mode
IPv6 VPN access
Compression support
Language Translation (localization)
Client-side authentication
Adaptive Security Appliance (ASA) and Adaptive Security Device Manager (ASDM) and any 
command-line interface (CLI) associated with the them
Adjusting Maximum Transmission Unit (MTU) size
Sequencing
Thin Client Control List Support
Although there is no limitation on the maximum number of filtering rules that can be applied for 
each access control list (ACL) entry, keeping the number below 50 should have no impact on router 
performance.
HTTP Proxy
This feature works only with Microsoft Internet Explorer.
This feature will not work if the browser proxy setup cannot be modified because of any security 
policies that have been placed on the client workstation.
Information About SSL VPN 
To configure SSL VPN, you should understand the following concepts: