SSO login Error 404--Not Found

[big]

Hi,
on R12.2.4 DB 11.2.0.4 on AIX
When connectin by
https://xxxx.fr/OA_HTML/AppsLogin

we receive:
Error 404--Not Found
From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:
10.4.5 404 Not Found


When verifying :
 ./admanagedsrvctl.sh status oaea_server1

You are running admanagedsrvctl.sh version 120.14.12020000.12

Enter the WebLogic Admin password:

oaea_server1 is running.


admanagedsrvctl.sh: exiting with status 0

$INST_TOP/appl/admin/oaea_wls.properties is like this: (empty)


SSO_SERVER_RELEASE=
SSO_SERVER_URL=
SSO_SERVER_TYPE=
LOG_CONFIG_FILE=DEFAULT
APPL_SERVER_ID=
OAM_LOGOUT_URL=
CONNECTION_REF=
WEBGATE_LOGOUT=
oracle.apps.fnd.sso.WebEntries=DEFAULT

Please advise.

Thank you.

[ErmanArslansOracleBlog]

When did this start to happen? After an upgrade, cloning maybe? What kind of SSO are you talking about? Custom or Standard (OAM + OID based solution..) You didn't provide any background info, and that makes things hard.

Anyways;
**This may be related to lots of thing.. But a problem with oacore is an important candidate to be the cause for these types of issues.  I mean there may be some oacore-related deployment problems.
Because you try to access Applogin which is an EBS page, and you get http 404..

Use FMW Console check the "deployments" to confirm the "oacore" application is at status "Active" and Health is "OK".

Lost of MOS documents around this, please review them ->

Unable To Open The E-Business Suite Login HTTP-404 Error. Error_log Shows "File does not exist: $INST_TOP/portal/OA_HTML/AppsLogin" (Doc ID 1177264.1)

12.2 E-Business Suite Users Report Error '10.4.5 404 Not Found From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1' When Attempting To Login After An Upgrade (Doc ID 2240807.1)

Not Able To Login To 12.2.6 After Upgrade (Doc ID 2355063.1)

**12.2 E-Business Suite Technology Stack Summary Of The iAS / HTTP Server Login Process And What To Expect When One Of The Login Components Fails (Doc ID 1984710.1) -- for quick diag.....