I wondered why when I tried to test my Protx VSPServer integration today that it just wouldn't work. I kept getting this SSL problem when submitting the HTTP POST:
does not match host name `ukvpstest.protx.com'
I assumed this was a temporary issue but have just found out that ProtX is rebranding to SagePay and you need to use the following domain for TEST and SIM:
There is also a new path for each operation so check out the table posted on the ProtX support forums: