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Cisco Bug: CSCup07330 - ASA: no auth prompt when accessing internet website using ASA-CX

Last Modified

Nov 27, 2020

Products (1)

  • Cisco Adaptive Security Appliance (ASA) Software

Known Affected Releases


Description (partial)

When a user launches a web browser  to access an encrypted/non-encrypted web site on the internet through  ASA-CX context filtering performing active authentication, no authentication prompt is received by the user resulting in a hung browser connection.

From left to right if the 3rd bit in the 2nd byte (3rd most significant bit in the 3rd hex nibble) of the mac address is set to one, the ASA will drop the SYN-ACK packet resulting in a failed TCP connection.  Since the user's browser never establishes a TCP connection with the CX  module, the user never receives an authentication prompt and this results in a hung browser connection.
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