iOS Device cannot login to SFB Client

[thet naing]

iOS Device cannot login to the SFB Client seeing the following error messages at login prompt.

• "We cannot connect to the server. Check your network connection, advanced options and try again" 
• "You account is not configure to connect to the server"

And the "SFBIOS.log" file is showing the following erros:

• Reived response of request(UcwaAutoDiscoveryRequest) with status = E_ConnectionError (E2-2-1)
• 2018-03-15 02:38:22.176 000000016e00b000 WARNING TRANSPORT CHttpConnection.cpp:1043 Request Type = UcwaAutoDiscoveryRequest, Error domain = NSOSStatusErrorDomain, code = -9807, detailedCode = errSSLXCertChainInvalid,ErrorDescription = The operation couldn’t be completed. (OSStatus error -9807.),ErrorFailureReason = 

Root Cause:

• Local (private) Certificate Authority's Root Certificate was not installed or not trusted in the iOS device.

Resolution:

• Installed Certificate Authority's Root Certificate in iOS device.
  • Email Root Certificate (the same root certificate installed on SFB FE server) to yourself as an attachment without zipping
  • Open the email on your iOS device, and click on the certificate , click Install and Done.
  • Reboot the phone and try to login again.
  • If you are still having the issue logging in, use 3G/4G connection to login and after successful login, switch the network connection to your office/LAN wireless connection

[#2]

Normally you shouldn't need to have internal certificates on your mobile devices. If you point lyncdiscover.domainname.com in the local and server to your reverse proxy then it will use the external public certificate. This way it will use external web services instead of internal web services

[#3]

Ya @Erwin Bierens , normally we don't have to do that, but for a certain reason, it seemed that I have had to install the internal root CA on one mobile device -- but the rest of the mobile devices I didn't have to do that.

[#4]

sounds like your issue is solved?