They seem to have changed the chrome://net-internals page and it doesn't seem to work anymore. I have tried flushing the socket pool too. It works in incognito.
Google-chrome – How to clear Chrome DNS cache now after they changed it
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I don't think you can, or even should be able to restore closed tabs in incognito.
Think about it for a second. By switching to incognito mode, you're asking your browser to not follow you around and not keep local data, and a second later you're asking for a closed tab? Kinda beats the purpose, no?
If you must have this functionality (again, beats the purpose of incognito imho), you can use a session manager (like Session Buddy) and mark it OK to run in incognito.
You can try flushing Chrome's DNS cache
If that does not work, consider disabling DNS prefetching.
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