Ping working , however unable to tracert to the server

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http://serverfault.com – We have a Solaris 10 server which is a Backup Server. This server is able to ping to client server A (Windows Server 2008), However unable to tracert to it. From Client server A , Ping and tracert to the Backup server is successful. Backup server is able to ping and tracert to client server B, Client Server B ( Windows Server 2008) is able to Ping and tracert to Backup Server The backup server and the client servers are in the same subnet. However, The backup team is unable to take backups from Client A as they are receiving an error " Connection Timed Out". Backups from Client B is success (HowTos)