Microsoft Forefront TMG Server stop working after changing the domain

We have Migrated all the servers to a new domain.TMG  SERVER 2010 stop responding after joining to a new domain.in the event log following errors are logged

old domain was abc.gov.ca

new domain is xyz.gov.ca

1-the kerberos client received s krb_ap_err_modified error from the server dm-tmg01$.the target server name used was ldap/dm-tmg01.abc.gov.ca:2171.this indicate that the target server failed to decrypt the ticket provided by the client.

2-Windows Could not start the microsoft Forefront TMG Managed control Service On local Computer Error:1068

3-Windows Could not start the microsoft Forefront TMG job schedular Service On local Computer Error:1068

4-Windows Could not start the microsoft Forefront TMG Firewall Service On local Computer Error:1068
kastro AbbasiIT consultantAsked:
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Peter HutchisonSenior Network Systems SpecialistCommented:
What account does the services run under? Local system, network service, local service or specific user?
Does the computer account exist in the new domain? Are there any SPNs that need creating?
Have any networks changed?
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