The pathing of your SOAP endpoints will change as a result of the upgrade to OpenEdge V12 and PASOE. Please adjust any integrations or other access you have using these endpoints on go-live.
Prior to v3.5.1
Currently, under OpenEdge V11, endpoints start with: https://ipaddress:8443/wsa/wsa1.
v3.5.1. Onwards
Now under OpenEdge V12 and PASOE, they will start with: https://ipaddress:8443/soap.
This update can also be found in the 3.5.1. release notes.