# "Cannot be reached" on various browsers

**URL:** <https://community.fly.io/t/cannot-be-reached-on-various-browsers/25687>\
**Category:** General\
**Tags:** machines, security, login-only\
**Created:** [August 19, 2025, 3:35pm UTC](https://community.fly.io/t/cannot-be-reached-on-various-browsers/25687 "2025-08-19T15:35:53Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![hvtor](https://sea1.discourse-cdn.com/fly1/user_avatar/community.fly.io/hvtor/32/42436_2.png) [@hvtor](https://community.fly.io/u/hvtor)\
**Post date:** [August 19, 2025, 3:35pm UTC](https://community.fly.io/t/cannot-be-reached-on-various-browsers/25687/1 "2025-08-19T15:35:53Z")

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I have been able to deploy my app, I’m able to access the application on my computer, but others on a particular network aren’t able to access it (hospital).

The message on the browser simply states: “Cannot be reached“ and it suggests proxy settings and firewall as the problem.

I’m not really able to manage to adjust the settings on colleagues’ computers, so I was wondering what I can do in my app to allow access to it.

What’s preventing access/sending warning messages to others who are trying to use the application?

This is the first time I’m using [Fly.io](http://Fly.io) so any advice would be helpful, thank you.

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**Author:** ![lillian](https://sea1.discourse-cdn.com/fly1/user_avatar/community.fly.io/lillian/32/49616_2.png) [@lillian](https://community.fly.io/u/lillian)\
**Post date:** [August 19, 2025, 3:58pm UTC](https://community.fly.io/t/cannot-be-reached-on-various-browsers/25687/2 "2025-08-19T15:58:00Z")

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it’s possible the target network is blocking [fly.io](http://fly.io) for some reason. you can try the following to see if it would help:

- use a [custom domain](https://fly.io/docs/networking/custom-domain/) rather than the default `.fly.dev`
- use a dedicated rather than shared IPv4 address (this will cost $2/mo): `fly ips allocate-v4` and update your DNS with the new address

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**Author:** ![halfer](https://avatars.discourse-cdn.com/v4/letter/h/df705f/32.png) [@halfer](https://community.fly.io/u/halfer)\
**Post date:** [August 20, 2025, 6:48pm UTC](https://community.fly.io/t/cannot-be-reached-on-various-browsers/25687/3 "2025-08-20T18:48:47Z")

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It would not be surprising for a hospital to have a very locked-down, very filtered, DNS and internet system. See if your colleagues can access the site on their mobile phones.

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**Author:** ![hvtor](https://sea1.discourse-cdn.com/fly1/user_avatar/community.fly.io/hvtor/32/42436_2.png) [@hvtor](https://community.fly.io/u/hvtor)\
**Post date:** [August 21, 2025, 1:50am UTC](https://community.fly.io/t/cannot-be-reached-on-various-browsers/25687/4 "2025-08-21T01:50:31Z")

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Yup, mobile phones work fine/outside computers work fine! It’s specific to the network. I changed to have IPv6 and IPv4 as well. No go. I think I’ll try to add a domain to it. That was the next suggestion I received.

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**Author:** ![system](https://global.discourse-cdn.com/fly1/original/3X/6/e/6e8955d00cb218e186ebbe3a6ab06fefdce15290.svg) [@system](https://community.fly.io/u/system)\
**Post date:** [August 28, 2025, 1:50am UTC](https://community.fly.io/t/cannot-be-reached-on-various-browsers/25687/5 "2025-08-28T01:50:32Z")

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