Please know that all IP-adresses present on both servers need to be unique for network rules to work.
Keep this in mind when configuring iSCSI networks on the backend of your servers.
This is not very clear in the User Guide.
Veeam Support helped me with this investigation. Case #07214475
I hope this post wil help save an other Veeam user some time
Thank you for sharing the case number, and sure, if you have a suggestion for a more clear explanation in the User Guide, please feel free to click the Submit Feedback link at the bottom of each User Guide page.
David Domask | Product Management: Principal Analyst