Portal Logon page repeating/ redirecting to itself on first attempt

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All,

Apologies in advance if this is not the appropriate forum. We are in the process of migrating a NW7.0SPS13/EP7.0SPS13 installation from a remote site to a local site with a database only UME and SSO to an ECC6.0 backend. The new target installation has picked up a rather odd behavior. When loggin onto the portal, the logon page repeats/refreshes/redirects to itself with valid ID and password with no error message. The only apparent action is the clearing of the password field.

My only clue so far is the absence of this script in the http trace on the initial logon attempt which shows up on the second attempt:

http://<host>:51100/irj/portalapps/com.sap.portal.httpconnectivity.httpauthentication/scripts/CAManagerScript.js

I did find this related thread and attempted the suggestions with no luck:

portal-logon-page-coming-again

I felt this might be the best place to post question since this may be an authentication/connectivity issue.

Thanks in advance,

Lee