Nsurl error domain (1012) subscribing MDM Server I'm trying to manage iPads with an own MDM-server. I configured the ProfileManagement but it doesn't work (anymore).. I always get an Nsurl error domain 2012 when trying to prepare the iPad (on the device). I searched a lot on the internet.. It seems to be with https? Certificates? But nothing specific for Profile Manager / MDM. 
So I don't have any idea what to do right now.

I'm preparing the iPads with Apple Configurator 2 (Version 2.2). I created a blueprint with the following settings for MDM:


Configuration: Manual
Server: https://mdmserver.domainname.be/devicemanagement/mdm/dep_mdm_enroll
(When I visit this URL in the browser, I get 405 Method Not Supported : GET)
...


There are a lot of certificates for the server, and maybe its because they aren't the good ones..

I don't have any Certificate for https://domainname.be..

Certificates of the server:


macServer > Messages (APN) (VPP appleid added):

mdmserver.domainname.be - apns:com.apple.calendar
mdmserver.domainname.be - apns:com.apple.contact
mdmserver.domainname.be - apns:com.apple.mail
mdmserver.domainname.be - apns:com.apple.mgmt
mdmserver.domainname.be - apns:com.apple.alerts


Under ProfileManager, I can add certificate.. But don't know how (where to download/find) and which one I have to use?





More additional information

Mac version: OS X El Capitan (10.11.4)

OS X Server: Server 5.1

Hostname: mdmserver.domainname.be

Computername: macserver

Internet: Available on mdmserver.domainname.be

I opened port 80,443,2195,2196,1640 on the firewall (https://support.apple.com/en-us/HT202487)
The problem is solved. The problem was caused by the certificates.
I really needed signed certificates for "mdmserver.domainname.be" (Server > Certificates).

But keep in mind, it has to be with a CSR created by the os server, it's not enough to create a CSR with a CSR generator (like directadmin, ..). Thats because you can't add your own private key/csr, the server has its own.

More information about the certificates install: https://www.digicert.com/ssl-certificate-installation-mac-osx-mavericks.htm
SSL Installation Diagnostics Tool: https://www.digicert.com/help/