# 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:** 6

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**Author:** ![GaurangTandon](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/gaurangtandon/32/52384_2.png) [@GaurangTandon](https://meta.discourse.org/u/GaurangTandon)\
**Post date:** [22. März 2016 um 02:31 UTC](https://meta.discourse.org/t/cannot-view-0-0-0-0-3000-in-browser-and-localhost-4000-gives-error/41357/6 "2016-03-22T02:31:04Z")

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> [@Mittineague](#):
>
> I recommend you don’t manually upgrade any gems and let Discourse handle the versions.

Unfortunately, I have already run `bundle update` ☹ Vagrant was constantly telling me:

> You are running an old version of bundler, please upgrade bundler ASAP…

And things weren’t working properly for me so maybe I thought this is the problem so I ran `bundle update`. Anyway to revert this to get things working properly?

And yes I am using bundle exec rails s -b 0.0.0.0 and localhost:4000

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