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Cisco Employee

AsyncOS 6.3.1-028 for Web is GA


Cisco is pleased to announce a maintenance release of AsyncOS 6.3.1-028 for Web to all customers (GA).

This release applies to all our Web Security Appliances (S-Series).

This new build addresses two severe defects that have been found in the former 6.3.1-025 GA release.

We encourage you to upgrade to this new build to benefit from the enhanced stability in 6.3.1-028.

Enhancements and Fixes in AsyncOS 6.3.1-028 for Web

  • Fixed: Some transparent HTTPS requests erroneously bypass all Routing Policies

and go directly to the Internet. [Defect ID: 55596]

Previously, when Routing Policy membership depended on data in a request header,

such as the URL, then transparent HTTPS requests failed to match the Routing Policy.

Instead, they were routed directly to the Internet. This no longer occurs.

Now, those transparent HTTPS requests match the Default Routing Policy.

  • Fixed: Web Proxy generates a core file and restarts in some cases. [Defect ID: 65975]

Previously, the Web Proxy generated a core file and restarted when repeatedly connecting to

servers that delivered 503 Bad Gateway responses to the Web Proxy. This no longer occurs.

For further information about this release, please refer to the AsyncOS Release Notes on our Support Portal:

While you are there, take the chance to have a look at the other new releases available currently:

Sawmill 7.3.2 and AsyncOS 6.3.3 FCS.

For an overview over the different release stages, have a look at this knowledge base article:

Best Regards,


  • Web Security
Cisco Employee

Re: AsyncOS 6.3.1-028 for Web is GA


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