When it comes to upgrading the Policy Server to version 12.9, there have been some concerns about the Web Agent 12.52SP1CR11.
As per the Support Matrix, the Web Agent 12.52SP1CR11 supported by Policy Server 12.9:
SiteMinder Policy Server 12.9 supports previous versions of Agents and Access Gateways (previously called Secure Proxy Server) (1).
The Web Agent 12.52SP1 CR11 is still supported, no EOS date has been defined yet (2):
| Product | Release | Service Pack/Genlevel | GA Date/ | End of Service (EOS) || | | | Announcement | End of Life (EOL) || | | | | or Stabilization Date ||-----------------------+---------+-----------------------+------------------+-----------------------|| SiteMinder Web Agents | 12.52 | SP1 CR11 | November 2, 2020 | No EOS Date Set Yet |
Finally, note that there's no Web Agent 12.9 version, and this is the reason why the browser gets error 404.
The latest Web Agent available is 12.8 (3)(4).