# Cannot view 0.0.0.0:3000 in browser, and localhost:4000 gives error

**URL:** <https://meta.discourse.org/t/cannot-view-0-0-0-0-3000-in-browser-and-localhost-4000-gives-error/41357>\
**Category:** Development\
**Created:** [21. März 2016 um 09:36 UTC](https://meta.discourse.org/t/cannot-view-0-0-0-0-3000-in-browser-and-localhost-4000-gives-error/41357 "2016-03-21T09:36:52Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![Mittineague](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/mittineague/32/114259_2.png) [@Mittineague](https://meta.discourse.org/u/Mittineague)\
**Post date:** [21. März 2016 um 21:30 UTC](https://meta.discourse.org/t/cannot-view-0-0-0-0-3000-in-browser-and-localhost-4000-gives-error/41357/5 "2016-03-21T21:30:53Z")

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> [@GaurangTandon](#):
>
> and bundle update both.

That may be your problem.

The Discourse Gemfile and Gemfile.lock files have versions for some gems specified.  
Despite what vagrant may be telling you, I recommend you don’t manually upgrade any gems and let Discourse handle the versions.

Also, are you starting it up with  
`bundle exec rails s -b 0.0.0.0`

Then, as said point your browser to `localhost:4000`

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