I have 2 Windows 2003 servers running ACS 4.2, authenticating with AD. I have configured TACACS+ authentication on both for my PIX 515 running version 7.24. TACACS+ authentication works fine on both. However, when I use the "aaa authentication enable console ProsperAdminAuth LOCAL" , the enable password works only with the first ACS server. When the first server is unavailable, it fails on the second ACS server and the Failed Authentication on ACS reports "ACS password invalid". It does not allow the LOCAL password either. I have verified all password and there is no issue there. I know that for sure because TACACS auth works. Anyone seen this issue or know what I could try?