office 365, exchange2010 (on premise)

I am trying to move the mailbox from on-premises to Office 365 from the o365 portal, when it come to confirm migration endpoint. It shows my migration end point url mail.happy-feet.in. however when it try to proceed further it gives me the following error

 

the connection to the server "name of on -premise server"could not be completed

earlier it failed due to too many bad items. I removed it from move request

now I cannot move to exchange online
pramod1Asked:
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Vasil Michev (MVP)Commented:
Double-check the endpoint settings via PowerShell (Get-MigrationEndpoint) or recreate it. For example, credentials might have changed.

Check whether you can access the endpoint externally to make sure no changes were made in DNS/firewall/LB/whatever that prevents you from accessing it anymore. For example, I cannot even resolve the url from your initial post.
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