That's a known issue in WordPress Multisite when using an IP and Google Chrome as browser. You can access your admin site without problems using Firefox.
In our clouds, we configure a transparent xip.io domain. You can configure it in the same way by running this command:
bnconfig.exe --machine_hostname yourip.xip.io
Please note that yourip must be the IP of your machine. Then you can access your site but using yourip.xip.io. If the IP of your machine changes, you'll need to start this process again.
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