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Cisco Bug: CSCuq57188 - ASA returns wrong content-length for cut-thru proxy authentication page

Last Modified

Nov 27, 2020

Products (1)

  • Cisco Adaptive Security Appliance (ASA) Software

Known Affected Releases


Description (partial)

When an ASA is configured for authentication proxy with 'aaa authentication secure-http-client', some browsers may not fully display the authentication page returned by the ASA. This happens because the content-length value in the HTTP response header is incorrect compared to the actual amount of content that is returned.

Although the ASA returns an incorrect content-length regardless of the browser being used, only some browsers will fail to display the login page correctly. Other browsers may display the page and not adversely affect the operation of cut-through proxy.

This issue only occurs for HTTPS-based authentication for the ASA's cut-through proxy feature. Other forms of authentication, such as Telnet and FTP, are not affected.
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