NFS mount hangs 5 minutes after a fresh reboot

Solution In Progress - Updated -

Issue

NFS mounts from networks outside of NFS client start hanging five minutes after each and every system reboot.
If the share is manually unmounted immediately after the boot process completes, and then manually mounted again, the problem does not occur.

Environment

Red Hat Enterprise Linux (RHEL) 6.8
Cisco Firewall

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