Why kdump fail to save vmcore on NFS server with error "Resolver Error 0 ( no error )" ?

Issue

• We wanted to dump vmcore on NFS share( /LinuxDump ) on host "linuxdump" and our kdump.conf file is configured like this ( net linuxdump:/LinuxDump ).
• We are not using DNS in our environment so we specified the NFS hostname in /etc/hosts file like this ( 192.168.122.174 linuxdump ).
• But at the time of panic, vmcore is getting stored on local machine at /var/crash instead of NFS share ( /LinuxDump ) and we are getting following error messages on screen.

deleting routers
adding dns 192.168.122.1
Saving to remote location linuxdump:/LinuxDump
mount: linuxdump: Resolver Error 0 (no error)
mount: nfsmount failed: No such file or directory.
mount: Mounting linuxdump:/LinuxDump on /mnt failed: No such file or directory
Attempting to enter user-space to capture vmcore
creating root device.
checking root filesystem.