Ical Blackhole Error

Go to Settings>Passwords & Accounts>Subscribed Calendars>

Click each sync'd item and look for the server address. Once you find the entry causing the issue, click Delete Account.

On my phone, it was a calendar I added via the SportsEngine app for my child's little league schedule. Once the league was over, the team was removed and I started receiving the error.

I had the issue. If you click on the details, you're able to see the site utilizing the certificate. Mine was a Sports Signup app for my kids baseball league. I deleted the app and re-added it. That seemed to fix the problem.

I turned off the share feature within the Dexcom app, and this error message stopped. Turned sharing back on and it returned. Dexcom support had me delete the app, reinstall, etc. So far, no error message. Will continue to monitor.

I was using SportsEngine but it really doesn't matter. Look through your list of calendars and see which one may be defunct. Delete any falling into that category. If you don't know which one is causing the issue, and it's annoying you (as it did me), delete them all and add back the ones you need.

In Settings app, go to Passwords & Accounts and check what accounts you use with Calendar app; see if you see calendar account/subscription that could be related to the prompt you see.

Are you, by any chance, using Amazon WorkMail Services? Does your work/job use that service from Amazon? The error that you mentioned suggests an affiliation with Amazon.

Go to Settings-->>Accounts & Passwords and check to see if anything related to AWS or Amazon is listed. If YES and you see something that shouldn't be in that list then tap on it and then choose delete.

Axel F.

That message means that you either accessed a site that has a configuration problem or you are using an app that accesses a site with a configuration problem. It’s purpose is to protect you from the bad guys. And you would get the same type of message on any computer that visited that site.

You may see a lot of them because Amazon Web Services (AWS), which is the largest computer hosting company in the world, replaced their expiring SSL certificates in March 2020 and some of their hosting customers failed to replace the expiring certificates.

That is an internal server address for a server hosted on Amazon Web Services (AWS). Probably has nothing to do with Amazon; AWS is the largest hosting provider in the world (I host 30 servers on AWS for my clients). So someone using AWS to host their website has an expired or invalid certificate. You should be able to tell who it is based on the app or site being visited when it appears.

I think we will see a lot of these soon. The AWS RSA key pair for their database service expires in March. They’ve been warning administrators about it for about 6 months. You need to update your database to use the new public key (it’s there to select from a drop down, no big deal), restart the database server. Then you need to update your apps with the new pem package and test. Or actually the reverse order; apps first because the new pem file includes the old keys.

but I bet a lot of people have been putting it off. I did ours only a month ago.

I had the same issue for a while. This is what I did. From Passwords and Settings, selected ‘Subscribed Calendars’.

I had two calendars that I had subscribed to and one was using ‘ server’ ical-blackhole........

I deleted that calendar and the issue is gone!

Thanks Lawrence. There was another thread asking the same question. and it had an image attached. I'll see if I can find it.

Here it is if that can help. Can not verify server identity - Apple Community

Check your calendar, it sounds like it is trying to connect to something.

Are you by any chance a diabetic using a Dexcom with the corresponding app?

Well, the error came back, so I turned sharing off within the Dexcom app, and going to leave it off for an extended amount of time to see if it occurs again.