Wait or revoking an iPhone expiring certificate?

In my iOS Provisioning Portal Current Development Certificates section, the certificate expiry date is Sep 30, 2010. Today is Sep 30, 2010. Should I wait for the certificate to expire and renew? Or should I revoke the existing one and create a new one certificate?

Currently, the Ad Hoc Provisioning Profile has expired. No matter how many times I click the Renew button next to it, the s开发者_高级运维tatus will become Expired. The means the app in all my beta testers' machines stops running and I cannot send a new version to them before a good Certificate is issued.

Thanks!

You can renew certificates before they expire, and this is typically a good idea. There's really nothing to be gained by letting them go, except (a) if you're not actively using them, you save a few steps and (b) a few days before expiration, next year.

However, for normal use, you just renew them a week or two before they expire.