App cannot be verified on ios 9

Question

I am running testing of an app on my iphone 6s running ios 9. Given the new feature introduced in ios 9 and xcode 7 release, I was able to test run my app on ios devices without getting the $99 membership.

Everything used to work fine. I trusted the developer ID and run the app without any issue until the last change I made to the code. Then I can see the app was installed but said "Not Verified". When I went to Settings->General->Profile, I can see under the developer's profile there is a button called "Verify App". However when I click the button nothing happened. The app remains unverified and cannot be verified thus cannot run.

Anyone experienced something similar? Any idea on how to fix the issue?

=========================================================== Update upon the issue disappear:

What I did is logging into apple developer website with the username. After logging in, the apps can be verified with no problem.

Answer 1

when establishing trust for the app developer's certificate connections to https://ppq.apple.com is made.

The above site had an invalid certificate which prevented the verification process.

As of now the issue has been resolved.