Proxy no Longer working after 5.6 upgrade

Issue

• Recently ran a yum update on our proxy server and now can no longer register clients or update them through it.

From /var/log/httpd/error.log:

Exception reported from proxy.example.com
Time: Tue Oct  8 11:31:54 2013
Exception type exceptions.KeyError
Exception while handling function handler
Request object information:
URI: /XMLRPC
Remote Host: 10.22.18.167
Server Name: proxy.example.com:443
Headers passed in:
        Accept-Encoding: identity
        Content-Length: 2172
        Host: proxy.example.com:443
        content-type: text/xml
        user-agent: rhn.rpclib.py/$Revision: 190936 $
        x-client-version: 1
        x-info: RPC Processor (C) Red Hat, Inc (version 195664)
        x-rhn-client-capability: packages.verifyAll(1)=1,caneatCheese(1)=1,packages.extended_profile(2)=1,reboot.reboot(1)=1,packages.verify(1)=1,packages.runTransaction(1)=1,packages.update(2)=2,packages.rollBack(1)=1,packages.verifyAll(1)=1,caneatCheese(1)=1,packages.extended_profile(2)=1,reboot.reboot(1)=1,packages.verify(1)=1,packages.runTransaction(1)=1,packages.update(2)=2,packages.rollBack(1)=1
        x-rhn-transport-capability: follow-redirects=3
        x-transport-info: Extended Capabilities Transport (C) Red Hat, Inc (version 190936)
        x-up2date-version: 0.4.20-86.el5
Extra information about this error:
Unhandled exception type

Exception Handler Information
Traceback (most recent call last):
  File "/usr/share/rhn/proxy/apacheServer.py", line 62, in __call__
    ret = f(req)
  File "/usr/share/rhn/proxy/apacheHandler.py", line 348, in handler
    handlerObj = rhnBroker.BrokerHandler(req)
  File "/usr/share/rhn/proxy/broker/rhnBroker.py", line 70, in __init__
    my_ip_addr = req.headers_in['SERVER_ADDR']
KeyError: 'SERVER_ADDR'

Exception reported from proxy.example.com
Time: Tue Oct  8 11:31:59 2013
Exception type exceptions.KeyError
Exception while handling function handler
Request object information:
URI: /XMLRPC
Remote Host: 20.32.24.212
Server Name: proxy.example.com:443
Headers passed in:
        Accept-Encoding: identity
        Content-Length: 2176
        Host: proxy.example.com:443
        content-type: text/xml
        user-agent: rhn.rpclib.py/$Revision: 190936 $
        x-client-version: 1
        x-info: RPC Processor (C) Red Hat, Inc (version 195664)
        x-rhn-client-capability: packages.verifyAll(1)=1,caneatCheese(1)=1,packages.extended_profile(2)=1,reboot.reboot(1)=1,packages.verify(1)=1,packages.runTransaction(1)=1,packages.update(2)=2,packages.rollBack(1)=1,packages.verifyAll(1)=1,caneatCheese(1)=1,packages.extended_profile(2)=1,reboot.reboot(1)=1,packages.verify(1)=1,packages.runTransaction(1)=1,packages.update(2)=2,packages.rollBack(1)=1
        x-rhn-transport-capability: follow-redirects=3
        x-transport-info: Extended Capabilities Transport (C) Red Hat, Inc (version 190936)
        x-up2date-version: 0.4.20-46.el5
Extra information about this error:
Unhandled exception type

Exception Handler Information
Traceback (most recent call last):
  File "/usr/share/rhn/proxy/apacheServer.py", line 62, in __call__
    ret = f(req)
  File "/usr/share/rhn/proxy/apacheHandler.py", line 348, in handler
    handlerObj = rhnBroker.BrokerHandler(req)
  File "/usr/share/rhn/proxy/broker/rhnBroker.py", line 70, in __init__

    my_ip_addr = req.headers_in['SERVER_ADDR']
KeyError: 'SERVER_ADDR'

Exception reported from proxy.example.com
Time: Tue Oct  8 11:32:08 2013
Exception type exceptions.KeyError
Exception while handling function handler
Request object information:
URI: /XMLRPC
Remote Host: 17.42.17.33
Server Name: vlslcsat01.regence.com:443
Headers passed in:
        Accept-Encoding: identity
        Content-Length: 2187
        Host: vlslcsat01.regence.com:443
        content-type: text/xml
        user-agent: rhn.rpclib.py/$Revision: 190936 $
        x-client-version: 1
        x-info: RPC Processor (C) Red Hat, Inc (version 195664)
        x-rhn-client-capability: packages.verifyAll(1)=1,caneatCheese(1)=1,packages.extended_profile(2)=1,reboot.reboot(1)=1,packages.verify(1)=1,packages.runTransaction(1