Cisco no longer offers evaluation images for ACS 5.5. Users are encouraged to migrate to Cisco Identity Services Engine (ISE) , which is the current replacement for ACS. 2. Installation Guide (Virtual Machine/Appliance)

If you are maintaining an isolated, legacy environment and require verification of your installation media, these are the baseline requirements and components that defined the Cisco Secure ACS 5.5 engine:

[ Cisco ACS 5.5 / 5.8 ] │ ▼ [ Cisco ACS Migration Tool ] │ ▼ [ Cisco ISE 3.x Deployment ] Why You Must Upgrade to Cisco ISE

Cisco Secure Access Control System 5.5 (specifically, build ACS_v5.5.0.46.iso ) was designed for robust RADIUS and TACACS+ authentication, authorization, and accounting (AAA).

Comprehensive Guide to Cisco ACS 5.5 ISO Download and Update (2026 Edition)

The safest method is the official Cisco Software Central. If you have an active service contract (SmartNet) associated with your account, you can often still access archived images. Log in with your . Search for "Secure Access Control System." Look for the 5.5.0.x release. 2. Physical Media Recovery

Ensure your system is backed up ( show running-config ).

Direct integrations alongside next-generation firewalls allow Cisco ISE to quarantine compromised devices instantly through automated policies.

Using end-of-life software like ACS 5.5 in a production environment is not recommended

Cisco Secure Access Control System (ACS) 5.5 is and no longer officially available for download from Cisco. Support for this version ended on April 30, 2018

To reset a lost CLI admin password, you typically need the original installation or recovery ISO for that exact version.