After applying APM 10.7 HF 24 or 25 or 26 Introscope WebServices are no longer accessible 

example URL test

wget http://localhost:8081/introscope-web-services/services/MetricsDataService?wsdl
.....

Reusing existing connection to localhost:8081.
HTTP request sent, awaiting response... 302 Found
Location: http://localhost:8081/introscope-web-services [following]
20 redirections exceeded.

The same would be reflected in a browser test to access the webservices URL.

Additionally this affects components such as the SOI connector which connects via Web Services API

Release:
Component: APMISP

Fix will be in 10.7 Sp3 workaround in meantime is to backout the Hotfix if Web Services access is required