Error 1418 in sql server Mirroing

Hi,
I m doing sql server database mirroring using two physical server which is on same domain.
prinicpal server -Dipak-Bandgar\SQL1
PORT NO USE FOR ENDPOINT 5022
NETWORK ADDRESS NAME -TCP://DIPAK-BANDGAR.EAT2EAT-SG.COM:5022

MIRROR SERVER - Swati-Pharate\SQL1
PORT NO USE FOR ENDPOINT- 5023
NETWORK ADDRESS NAME -TCP://Swati-Pharate:8080

BOTH SERVER ARE IN SAME DOMAIN
ENDPOINTS CONFIGURED SUCCESSFULLY.
PORT IS ALSO OPENED (CHECKED VIA TELNET)
FIREWALL IS ALSO OFF.
BOTH USER HAVING ACCESS OF ADMIN ACCOUNT.
BOTH SERVER ARE IN LAN
Using sql server enterprise edition 2012

ALTER DATABASE DatabaseName SET PARTNER = N'TCP://PrincipalServer:PortNumber'
This command is working fine on mirror server . but i mgetting same error while running on principal server.

but still m getting error 1418.
please help .

Thanks in advance.

SQL error 1418 is a database mirroring error.This error happens when the server network endpoint did not respond due to the specified server network which cannot be reached or it does not exist.
Troubleshoot SQL error 1418 by going through the below link:
http://www.sqlserverlogexplorer.com/database-mirroring-error-1418/

hi.
m tried that solution. but still same error.