You have to configure:
management-access mgmt_if
Command Reference:
management-access
Enables access to an internal management interface on the firewall.
[no] management-access mgmt_if
show management-access
Syntax Description
mgmt_if
The name of the firewall interface to be used as the internal management interface.
Defaults
None.
Command Modes
The management-access mgmt_if command is available in configuration mode.
The show management-access is available in privileged mode.
Usage Guidelines
The management-access mgmt_if command enables you to define an internal management interface using the IP address of the firewall interface specified in mgmt_if. (The firewall interface names are defined by the nameif command and displayed in quotes, " ", in the show interface output.)
In PIX Firewall software Version 6.3, this command is supported for the following through an IPSec VPN tunnel only, and only one management interface can be defined globally:
SNMP polls to the mgmt_if
HTTPS requests to the mgmt_if
PDM access to the mgmt_if
Telnet access to the mgmt_if
SSH access to the mgmt_if
Ping to the mgmt_if
The show management-access command displays the firewall management access configuration.
Examples
The following example shows how to configure a firewall interface named "inside" as the management access interface:
pixfirewall(config)# management-access inside
pixfirewall(config)# show management-access
management-access inside
See:http://www.cisco.com/en/US/products/sw/secursw/ps2120/products_command_reference_chapter09186a00801727ab.html#wp1137951
sincerely
Patrick