JTGarrett
Level 1 (0 points)

Q: Calendar can't verify the identity of the server

Almost every morning, when I open my MacBook Pro at work, Calendar immediately throws an error saying "Calendar can't verify the identity of the server _________". Whenever this happens, invariably, iTunes does the same thing.

 

This has persisted across multiple versions of OS X and iTunes.

 

If I tell Calendar / iTunes to just "Continue" everything is fine. But this error is very annoying,

 

How can I take care of this? Are the certificates really being spoofed? Or is this some kind of spurious error? How can I tell?

 

If anyone can give any guidance, I would appreciate it. Thanks in advance!

MacBook Pro (Retina, 15-inch, Late 2013), OS X El Capitan (10.11.3)

Posted on Jan 29, 2016 6:21 AM

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JTGarrett

Q: Calendar can't verify the identity of the server

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  • by Linc Davis,

    Linc Davis Linc Davis Jan 29, 2016 4:12 PM in response to JTGarrett
    Level 10 (207,936 points)
    Applications
    Jan 29, 2016 4:12 PM in response to JTGarrett

    There may be a button marked Show Certificate in the warning dialog. Please click it. A certificate chain will appear. One or more of the certificates in the chain will be marked with a red X as invalid. Select the uppermost invalid certificate. Some information about it will appear below. Post a screenshot that shows the certificate chain and the problem with the invalid certificate.

    That information is not personal, but be careful not to include anything else that is.

    Start a reply to this message. Drag the image file into the editing window to upload it. You can also include text in the reply.

  • by scohic,

    scohic scohic Mar 8, 2016 12:59 AM in response to Linc Davis
    Level 1 (0 points)
    Mar 8, 2016 12:59 AM in response to Linc Davis

    I've got a similar problem, I use GoogleCal which is linked to my work and friends iCal on my iMac and all updated via iCloud so 3 or 4 iCals being accessed.

    I somehow hit the 25, 000 entry limit on iCloud so after much discussion in the shops was advised to start to move the older entries from iCloud to GoogleCal and this went well and the work and mates iCal started updating again.

    Yesterday I got the message... Calendar can't verify the identity of the server "p23-caldav.icloud.com" on about the fifth iCal appointment I amended

    Read the threads here and examined the certificate and its in China so checked Firewall and run Avast and rebooted.

    Today I managed to move 10 items over from my old iCal to GoogleCal and the message reappeared.

    Any ideas? Im not confident so just stopped to see if anyone here can offer advise

    Screen Shot 2016-03-08 at 08.41.59.png

  • by workless,

    workless workless Sep 10, 2016 5:00 PM in response to Linc Davis
    Level 1 (4 points)
    Sep 10, 2016 5:00 PM in response to Linc Davis

    I have the same problem for the first time today when I logged in at the library.

    Calendar Screenshot 160910 1657.png