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300-730 · Question #225

Refer to the exhibit. An engineer recently applied several configuration changes to a Cisco Adaptive Security Appliance; however, users report that a web app requiring Java plug-ins has stopped…

The correct answer is C. The `http-only-cookie` command prevents the Java plug-ins from accessing the session cookie, causing the app to fail. The http-only-cookie enable command sets the HTTPOnly attribute on Clientless SSL VPN session cookies, which blocks Java plug-ins from reading the session cookie and causes Java-dependent web apps to fail.

Troubleshooting Using ASDM and CLI

Question

Refer to the exhibit. An engineer recently applied several configuration changes to a Cisco Adaptive Security Appliance; however, users report that a web app requiring Java plug-ins has stopped working through the Clientless SSL VPN. What must be the cause of this issue?
webvpn
enable outside
http-only-cookie enable
svc ask none default svc enable
port-forward auto

Options

  • AThe svc ask none command is blocking the required Java plug-ins for the app.
  • BThe port-forward auto command is preventing the ASA from recognizing the Java plug-ins, causing the plug-in to be blocked.
  • CThe http-only-cookie command prevents the Java plug-ins from accessing the session cookie, causing the app to fail.
  • DThe enable outside command is misconfigured and blocking external web traffic.

How the community answered

(48 responses)
  • A
    8% (4)
  • B
    6% (3)
  • C
    67% (32)
  • D
    19% (9)

Why each option

The `http-only-cookie enable` command sets the HTTPOnly attribute on Clientless SSL VPN session cookies, which blocks Java plug-ins from reading the session cookie and causes Java-dependent web apps to fail.

AThe `svc ask none` command is blocking the required Java plug-ins for the app.

The `svc ask none default svc` command controls which VPN mode is offered to connecting clients by default and has no effect on Java plug-in loading or functionality within a Clientless SSL VPN session.

BThe `port-forward auto` command is preventing the ASA from recognizing the Java plug-ins, causing the plug-in to be blocked.

The `port-forward auto` command enables Clientless SSL VPN port forwarding for TCP-based application proxying and does not interfere with Java plug-in detection or execution in the WebVPN portal.

CThe `http-only-cookie` command prevents the Java plug-ins from accessing the session cookie, causing the app to fail.Correct

When `http-only-cookie enable` is configured on a Cisco ASA, the HTTPOnly flag is applied to the WebVPN session cookie. Java plug-ins and applets use the Java networking API to access session cookies for portal authentication; the HTTPOnly attribute explicitly blocks any non-HTTP access to that cookie, including Java, causing Java plug-in dependent applications to fail within the Clientless SSL VPN portal.

DThe `enable outside` command is misconfigured and blocking external web traffic.

The `enable outside` command is the standard, required syntax to activate WebVPN on the outside interface of the ASA; it does not selectively block external web traffic or Java plug-in content when correctly configured.

Concept tested: ASA Clientless SSL VPN http-only-cookie blocking Java plug-ins

Source: https://www.cisco.com/c/en/us/td/docs/security/asa/asa96/configuration/vpn/asa-96-vpn-config/vpn-webvpn.html

Topics

#Clientless SSL VPN#ASA configuration#http-only-cookie#Java plug-ins

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