My distribution certificate is tied to an app, that I have distributed ad hoc to number of field employees, and it says it's going to expire tomorrow. When I go into the iOS provisioning portal, I go to the certificates link, and then the Distribution tab. Under expiration date for the certificate the date is listed as tomorrow. My question is how do I renew the certificate? I've been told there may be a renew button that pops up when it expires. I've also been told this renew button is going to pop up today when it hasn't. Is there going to be a renew button? Will the renew button pop up under the provisioning profile attached to the certificate or in certificates-->distribution in the portal? None of this is documented anywhere on what I need to do to ensure no down time with my app.
Thanks for the help!
Once expired, you will get a renew button, yes. If you want to do it before it expires, revoke the current certificate and you will get a button to request a new one.
Which ever way you do it, your ad hoc app will stop working tomorrow and you should distribute a new build with new provisioning profile signed with new certificate.
From the apple developer support center certificates section:
iOS Distribution Certificate (In-house, Internal Use Apps)
Users will no longer be able to run apps that have been signed with this certificate. You must distribute a new version of your app that is signed with a new certificate.
来源：https://stackoverflow.com/questions/7096254/iphone-app-how-to-renew-an-expired-distribution-certificate-through-the-ios-pro