Network and Port address translation
NetBackup does not currently support the use of Network Address Translation (NAT) or the Port Address Translation (PAT).
For additional details see, the technote NetBackup support for NAT and PAT.
Ransomware attackers specifically target and attempt to destroy backup systems to increase the probability of payment. Hardening your system is critical. Please ensure you have reviewed your platform security using the Security Hardening Checklist