Hello,
I see that you require "Rx4DefsSEP" Utility.
Again, as the Thread below and comment above by Pete:
https://www-secure.symantec.com/connect/forums/update-virus-symantec-endpoint-protection-11
It has been clearly stated that you may have to Contact Symantec Technical Support.
However, It seems you are facing issues creating a case from Symantec MySupport Website.
In that case, I would request you to Call Symantec Technical Support. Once you have the Case #, simply PM the Case number and I assure you would receive the "Rx4DefsSEP" Utility.
Phone numbers to contact Tech Support:-
Regional Support Telephone Numbers:
United States: https://support.broadcom.com (407-357-7600 from outside the United States)
Australia: 1300 365510 (+61 2 8220 7111 from outside Australia)
United Kingdom: +44 (0) 870 606 6000
Additional contact numbers: http://www.symantec.com/business/support/contact_techsupp_static.jsp
How to create a new case in MySupport
http://www.symantec.com/business/support/index?page=content&id=TECH58873
Hope that helps!!!