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I've installed VirtualBox 5.0.6 on Windows 10 64bit, and configured and installed a guest VM with Debian Jessi. Everything works fine at this point.

Then I configured two port forwarding rules: port forwarding rules

One called ssh the other one called tcp/8080.

At this point, everything still works. But, after restarting the host OS, I was no longer able to run the VM with the port forwarding rules.

I got the following error message:

NAT#0: configuration query for "GuestPort" int failed (VERR_CFGM_VALUE_NOT_FOUND) Failed to attach the network LUN (VERR_CFGM_VALUE_NOT_FOUND)

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The following answer to another question with a different erreor message solved the problem:

It turns out that the name of the forwarding rule should certainly not contain any parentheses or slashes (as shown below). So, when you set a forwarding rule, use a name that consists of spaces, letters or numbers to be safe.

Source

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