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Full CalDAV bi-directional sync for SugarCRM. Use your native calendar on your favorite device to synchronise calls, meetings and tasks. Works with Apple (iOS), Android, and Thunderbird/Lightning.

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#2790 - Invalid server answer when i set the new account in calendar

Closed Bug? created by nordestinnovazione Verified Purchase a year ago


I have installed activity sync in the crm of a client of mine and activated the license correctly.
When i set the new account in my Android mobile calendar i get the following error: "Invalid server answer, check URL". I have followed the instructions but i can't connect , also another member of my team tried with an i phone but he get the same error.
The crm version is 7.6.6 while the PHP version installed in the server is 7.0
Could it be a version problem?

Thanks in advance for the support.


  1. Opacus member avatar

    Opacus Provider

    a year ago


    Can you just confirm that you have put the appropriate protocol on the beginning of your URL (http:// _or _https://). Additionally, make sure you're using a CalDev enabled calendar app.

    If none of this works or helps, can you contact where we can assist you further.

    Kind Regards,
    Oliver Scase.

  2. Opacus member avatar

    Opacus Provider

    about a year ago

    Closing as no response.

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