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IPsec Site to site VPN main office Application hosted Server's Hostname resolve issue-Reg

Main office 2901 Model router---Windows DNS Domain with DHCP server configured.

Branch Office 1841 Model Router---No DNS Server, its DHCP configured in Router, 4Computers with workgroup

Hi configured IPsec site to site VPN in my IOS routers,Main office having DNS with DHCP windows server,but Branch office DHCP configured DHCP configured in IOS router, Main office's DNS server ip also fixed in brach office DNS settings,but not able to communicate main officer application hosting server from bracj office, but IP with server hosting application working fine,Ip address able to ping successfully, How need to fix ip hostname resolver issue? please help me for changes.

Please help me to fix...Issue with Router DNS or main office DNS server configuration? please help me to fix.Advance thanks

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