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You are here: Home / Not working? / Connection Insecure: Unable to access / add email accounts

Connection Insecure: Unable to access / add email accounts

Last updated on February 23, 2016 By Serhat Kurt 49 Comments

Several Mac users have reported an issue in which email accounts (Yahoo or Gmail etc) cannot be added. Users receive the following error message:

Connection Insecure
Failed to verify the server certificate. This could be because of your network configuration or your proxy settings.

connection insecure

You may also see experience this problem when you want to send or receive mails, because Mail app on your Mac may not connect to your email account.

Even though this error message says this could be because of network or proxy setting issues, users have stated that they are experiencing this problem when in fact there’s no network connection or proxy issues.

Fix Connection Insecure Problem

If you are having this issue, here is how you can troubleshoot:

1-Try temporarily disabling your antivirus software. It is known that sometimes antivirus software may cause this problem. If this solutions does not solve your issue, read on.

2-Expired / revoked SSL certificates may cause this problem. Find and remove them. Here is how you can fix it:

a-Launch Keychain Access (Applications > Utilities).

b-Select “My Certificates”.

Keychain access

c-Now, find expired / revoked certificates, if any. Expired / revoked certificates will have a red X sign. Find also certificates with a red X mark saying “This certificate was signed by an untrusted issuer” or “This certificate was signed by an unknown authority”. When you find them, delete them.

expired SSL

d-When you are done, restart the Mail app.

Filed Under: Not working? Tagged With: Mail App, Mail not working

Comments

  1. Laurent Daudelin says

    January 22, 2016 at 9:38 pm

    That doesn’t work.

    Reply
    • Dave G. says

      April 13, 2016 at 10:13 am

      Did you disable your antivirus software? I have the Avast suite, and it was necessary for me to disable the web shield, the mail shield and the system shield in order to successfully add my Google account to my Macbook Pro. Good luck!

      Reply
      • Sam says

        July 11, 2016 at 5:48 am

        Thank you! This was the problem!

        Reply
      • Allison says

        September 25, 2016 at 6:04 pm

        Thanks, that was my issue too 🙂

        Reply
      • michelle says

        October 13, 2016 at 1:37 am

        Thank you. I have gone through every certificate, kept trying everything. Yep had to disable as well

        Reply
      • trisha says

        October 23, 2016 at 3:53 pm

        Hi Also worked for me once I turned off Avast. Were you able to switch it back on again afterwards? or do i need to find another anti virus suite?
        thanks

        Reply
      • Hayden says

        November 15, 2017 at 10:05 pm

        Same! I just diabled the mail server and it worked perfectly. thanks!

        Reply
  2. Greg Watts says

    May 15, 2016 at 6:15 pm

    Disabling my Kaspersky antivirus allowed me to add my gmail account. So many thanks for the suggestion….

    Reply
  3. Kenn says

    July 18, 2016 at 2:03 am

    Just delete the Login Certificates using the Keychain Accesses.

    Reply
  4. Sara Moody says

    August 18, 2016 at 5:48 am

    I phoned Apple and they told me to rest the NVRAM but that made no difference. Finally found this feed and I disabled Avaast and all was well and I could add it. Thank you!

    Reply
  5. Es Jay says

    September 20, 2016 at 3:34 pm

    I had to turn off Avast to connect my Google/S Planner calendar to iCal. Thanks for the info.

    Reply
  6. Pam Schroeder says

    September 23, 2016 at 10:53 am

    When I tried to disable Avast it wouldn’t recognize my password. Then when I tried to get a new password, it would not recognize my gmail or regular email. It said it was not in the system. Therefore, I can’t disable my Avast account. Any ideas what to do?

    My initial problem is I keep getting the following message when I try to access my email account on my iMac:
    Connection Insecure
    Failed to verify the server certificate. This could be because of your network configuration or your proxy settings.

    Reply
  7. Janise says

    September 25, 2016 at 6:37 pm

    I don’t have anti virus software on my mac to disable. What else could help me set up Yahoo email?

    Reply
  8. Allan Williamsn says

    October 18, 2016 at 4:22 pm

    Brilliant sorted

    Thanks

    Reply
  9. Laura says

    October 23, 2016 at 5:01 am

    Disable Avast’s web/mail shield
    It helped me!

    Reply
  10. Simgund says

    October 29, 2016 at 12:41 am

    Disabling AV did the trick

    Reply
  11. Mark Friedman says

    October 29, 2016 at 3:08 pm

    doesn’t work on a mac (no antivrus software)

    Reply
  12. Annette W says

    December 13, 2016 at 12:35 pm

    Disabling the antivirus software temporarily on my MacBook Pro solved this problem immediately. Thank you !!

    Reply
  13. Eerk Hofmeester says

    January 3, 2017 at 9:11 am

    Hi all. In my case the ‘anti virus’ software was Adguard, an add blocker. So please be aware that it’s not necessarily an anti virus application that’s causing this. After switching Adguard off adding a Google account was a piece of cake.

    Reply
    • Marin says

      January 10, 2017 at 7:31 pm

      Funny thing is that deleting all certificates on my iMac and rebooting afterwards helped me. But on my MBP, that didn’t work. But disabling adguard helped, so thanks for that. Funny thing is that I have adguard on my iMac as well.

      Reply
      • Sherif says

        June 11, 2017 at 11:51 am

        That’s Worked for me!

        Reply
    • Lior says

      February 17, 2017 at 8:49 pm

      Oh! Great!
      That worked for me!
      I didn’t even think about Adguard and only turned off Bitdefender…

      Thank you very much! 🙂

      Reply
    • Michael says

      April 8, 2017 at 12:57 pm

      Adguard was the problem! Thank you so much!

      Reply
    • Michael says

      May 8, 2017 at 4:03 pm

      AH, THANKS! I have adguard as well and was trying everything else mentioned here but to no avail. Adguard did the trick. Once disabled, it worked like a charm. Thanks!

      Reply
    • Eddie says

      June 20, 2017 at 12:34 am

      Thank you very much. ADGUARD was the cause of my issue as well. I turned it off and was able to add my Google account.

      Reply
  14. Vince Oblak says

    January 17, 2017 at 1:05 am

    Literally nothing here or on any page I’ve seen fixes my issue. I have the same issue as the OP, but I have no antivirus and no expired certs.

    Reply
    • Philip says

      February 10, 2017 at 4:51 pm

      I found this on another thread and it worked for me. “Delete the account, then add it back. After filling in the 1st screen, hold down the option/alt key while clicking Continue. Fill in the necessary information, then click continue until all screens are filled in.”

      Reply
      • Marie McLean says

        October 16, 2017 at 1:03 am

        Thank you so much for this advice. It worked for me after trying absolutely everything else. My sanity has been restored!

        Reply
  15. Antony Homer says

    January 23, 2017 at 9:40 pm

    Thank You Very Much did What you said and it’s working fine now

    Reply
  16. Olga says

    March 3, 2017 at 9:46 pm

    OMG!!!! I did everything listed above, and I still continue to get the same message. I was scared of deleting the expired certificates, but did it anyway, and now, nothing worked, and I’m still in the same boat. I’m getting the same message for Yahoo, and for google mail.
    I don’t even have any anti-virus to turn off! What else can I do to get the mail to work? It works perfectly on my phone, but no on my macbook!!
    Please help

    Reply
    • nora says

      April 1, 2017 at 3:55 pm

      That’s exactly the same with me. It works ok on my iPad and android phone buy not on my mac 10.11.6

      Reply
  17. Arianna says

    March 16, 2017 at 11:44 am

    THANK YOU VERY MUCH! I have Avast and that was the problem.

    Reply
  18. Andy Gambongo says

    March 24, 2017 at 9:25 pm

    Thanks i had changed my google email password and then was getting this issue on my Mac os X 10.11.6 i turned off Adguard and was able to set up my google email account again with no issues. i then turn on Adguard again all seems to be working well

    Thanks

    Reply
  19. michael says

    May 25, 2017 at 4:44 am

    Thank You so much! After all the post this one did the job! Great tech advise I will follow this source moving forward!

    Yes Lawd!!!!!!!!

    Reply
  20. Karel Theodor says

    May 27, 2017 at 9:35 pm

    Yes, disable Avast. Thank you.

    Reply
  21. Gary Kyle says

    June 6, 2017 at 3:01 am

    Thank you!!!!!! I’ve had Genius phone calls and read every kind of voo-doo resolution on the internet–none were useful. I followed this group’s advice and resolved the problem in about five minutes!!!!

    Reply
  22. Andrew says

    June 19, 2017 at 2:40 am

    Ok, for those who the above suggestions didn’t work, the next question is do you have Qustodio installed on your Mac? If so, it will need to be temporarily disabled to allow the account to be added.

    Note that Qustodio also stuffs up 1Password v6 in regards to working with browser extensions. While Qustodio has a help section describing things that stop it from working, it would be nice if they add information on things Qustodio stuffs up!

    Reply
    • Keith says

      July 11, 2017 at 5:58 am

      Thank you Andrew!! This was my issue – I temporarily disabled Qustodio and was able to add my Google account!

      Reply
    • Mike says

      July 26, 2019 at 1:29 am

      Thank you, thank you, thank you!!! I was getting very frustrated and concerned I would have to call someone to fix this issue. Glad I kept reading the chain. Your callout on Qustodio was the issue, really appreciate your help.

      Reply
  23. Scott says

    August 2, 2018 at 2:14 pm

    The solution for me was the Qustudio parental control App!!!!

    Reply
  24. Buana says

    August 5, 2018 at 2:58 pm

    hi,

    I’m new to macboook and just want to setup email, nothing installed.
    just standard apps.

    please advise, thanks

    Reply
  25. Mike says

    August 12, 2018 at 10:20 pm

    Fixed it for all the mac users with no anti virus. the clock was set to the wrong time. I had to open the preferences and deselect set time automatically and then reselect. Then all is good!

    Reply
  26. Cynthia says

    August 25, 2018 at 12:33 am

    none of this worked for me,I don’t have virus software, I have never had this trouble adding a gmail, just added a different one two weeks ago, I was deleting this account to figure something else out, but now I can’t get it back on. I donate have adguard, or avast or Qustudio, I have no certificates, and I’ve looked for adblockers. Its a Mac 10.13.5 (yes I need to update my software probably.. but seriously WTF?

    Reply
  27. Keaton Driedger says

    August 25, 2018 at 3:43 am

    MacBook Pro out of the box and have installed NOTHING. Won’t allow a gmail account to be added to Mail. I guess I will install the Apple updates I just got notified about. I’m not feeling good about it.

    Reply
  28. lina says

    August 25, 2018 at 5:11 am

    hey there everyone. I really hope someone can help because I’ve been going crazy over this same issue. I just got my MacBook Pro and I’ve gone through the initial setup and now trying to log into my Google accounts, through Internet Accounts, but I’m getting the same message. I have nothing on this computer. No Ad blockers, no anti virus, nothing. Can someone help??

    Reply
  29. Ahmet says

    August 25, 2018 at 10:05 am

    I have just format my Imac and there is no any program.Fresh, it gives still same warning

    Reply
  30. GDM says

    November 21, 2018 at 10:50 pm

    I recently tried to add an additional Google account to my Mac using the System Preference pane. However, I encountered the error Connection Insecure – Failed to verify the server certificate. This could be because of your network configuration or your proxy settings.

    This was on a newly configured MacBook Pro with macOS Mojave 10.14.1 that I had logged in with my Apple ID, which had been used previously so obviously was bringing along with it certificates from my previous systems via the iCloud Keychain.

    For me the fix was in the macOS keychain. Close System Preferences. Open Keychain Access (using macOS Spotlight search) and in the upper left, select “login” keychain, in the lower left, select “Certificates” and I had 2 (two) certificates listed “COMODO Client Authentication and Secure Email CA” and “UTN-USERFirst-Client Authentication and Email” I copied these out to my desktop (as a precaution) and then deleted these two certificates from the Keychain. I closed Keychain Access app and re-opened System Preferences. I can now add Google and Yahoo email accounts again from “Internet Accounts” preference pane.

    Reply
  31. WM says

    December 5, 2018 at 5:26 am

    AAAAAAAAAAAAAAAAAAAAAAAH It literally doesn’t work at all. I’ve done everything in the comments and the article, and I still can’t add a google account.

    Reply
  32. Terese Walker says

    April 23, 2019 at 1:11 am

    I have done everything too. I don’t have virus protection or certificates either.

    I can’t load my bigpond email on and Apple and Telstra can’t help me either

    Reply

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