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As per the output PBX is listening properly . But i think due to three network interfaces it's getting confused .
Ping the client from your system and findout excatly which is the IP it's using . Then you add the same IP in master server host file (i.e. system32\drivers\etc\hosts) , in host file you 1st add the IP address and then host name , save and close the host file . After this try the backup , it would resolve your issue . If still you have issue then try the below steps ,
open the client properties of "netbackup-srv" from master server and then go to the universal setting tab in that right side you can see that a option 'use specified network interface' in that give the IP address 192.168.11.108 which is from the output given above . Then the client will communicate only with this IP address . Then you can try backup .