Iphone Push Notification: Certificate revoked

I've an Iphone application made with Titanium, I've enabled notifications. In order to send the notifications (sandbox) I'm using https://github.com/simonwhitaker/PyAPNs, everything was working great. But suddenly when I try to send a notification, I receive this message:

error:14094414:SSL routines:SSL3_READ_BYTES:sslv3 alert certificate revoked

In the provisioning portal, the certificate is enabled. I don't know what's the problem.

woul开发者_JAVA技巧d It be possible that problem comes from I've installed the app again in the iphone?

I'm not sure if I should revoke the "Development Push SSL Certificate" in the provisioning portal and start from scratch.