Error Message : Connection Timeout Expired. The timeout period elapsed while attempting to consume the pre-login handshake acknowledgement. This could be because the pre-login handshake failed or the server was unable to respond back in time. The duration spent while attempting to connect to this server was – [Pre-Login] initialization=13477; handshake=14506; 
Error comes when try to connect sql server instance from another machine

Solution:
Enable port 1433 in firewall.
Happy SQLing! 

Thanks & Regards,
Mail ID: pandit.umesh@hotmail.com
Skype ID: pandit.umesh

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