Unable to Enroll Android and iOS devices to Xenmobile

Xenmobile -device enrollment was working fine but suddenly it stopped working. Getting the following error device logs

FTUAddAccountActivity:addAccount() called with serverType ACCESS_GATEWAY_EE_PASSWORD_ONLY_WITH_ACCOUNT_SERVICE
FTUAddAccountActivity:Received user name from intent
FTUAddAccountActivity:Received password from Intent
FTUAddAccountActivity:Proceeding to account creation without user intervention.
coreAuthenticateWithAuthn:Got NSC_VPNERROR_COOKIE : 4001
com.citrix.work.vpnutils.VpnDiagnosticHelper:addRoutingTableToSupportBundle: failed because VPN is not connected

Both Android and iOS devices were unable to enroll to Xenmobile MDM. My configuration contains MDM and App controller.

Issue: I couldn't find any wrong in PKI, LDAP configuration and MAM+APPController integration. I went different logs and found that APP controller issue.

MDM only enrollment - Successful
AppController from browser /reciever- Accessible
App Controller with WOrxHome enrollment - failing
MDM+Appcontroller Enrollment -failing

I found that proxy server was down which causing the enrollment failure after intensive debugging. So intermittent solution proxy server info has been removed all Mobility servers including App controllers and has been given direct access to internet for mobility servers. Now we are able to enroll devices after removing proxy info. Hoping my proxy will come back online soon and will be reverted configuration back to proxy.

Have a nice day!