Outbound requests from Oracle HTTP Server mid-tiers should go through the OnDemand HTTP proxy services, www-proxy.oracleoutsourcing.com and omcs-proxy.oracleoutsourcing.com, which are the BIG-IP virtual servers that load balance the actual physical devices.
To ensure continued connectivity, the subnets for the new proxy service must be allowed access in customer's firewall. Please see 'What are the IP Addresses for OSN' (Doc ID 435409.1) for a listing of the required subnets. You may open the firewall to receive requests from the subnets mentioned in the note.
These configuration changes need to be done by 16th Feb 2014, 10:00 AM GMT. If you do not complete these changes before the mentioned time, the documents delivered by Oracle Supplier Network might fail to reach your ERP system."
For more information see the Procurement Community thread: 'Urgent!!! FAQ - Change in the HTTP Proxy Service Used for Oracle Supplier Network (Doc ID 1620906.1)'.