I have a working monitor! Thanks to the help of my local F5 sales engineer a resident SOAP expert within F5 that he solicited for help (John Alam). He found two errors in my SOAP message - the URI following the POST message was incorrect. He found this by comparing my monitor string to the string in the SOAP request generated by SOAP-UI from my customer. The 2nd error he identified was missing whitespace in the SOAP envelope statement, before 'xmlns:v1'. Once I fixed those 2 errors - my pool members turned green. Thanks so much for all your help, mimlo!