# Help: Application cannot start again

**URL:** <https://replit.discourse.group/t/help-application-cannot-start-again/3649>\
**Category:** Agent & Assistant\
**Created:** [February 12, 2025, 10:53pm UTC](https://replit.discourse.group/t/help-application-cannot-start-again/3649 "2025-02-12T22:53:53Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![onechimad](https://yyz2.discourse-cdn.com/flex010/user_avatar/replit.discourse.group/onechimad/32/821_2.png) [@onechimad](https://replit.discourse.group/u/onechimad)\
**Post date:** [February 12, 2025, 10:53pm UTC](https://replit.discourse.group/t/help-application-cannot-start-again/3649/1 "2025-02-12T22:53:53Z")

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It is seems the app host is block and at such the application preview is not avalaible again in vite.config.ts, any one with similar issue?

## Here is the error seen: Blocked request. This host (“ca4aedd4-fa44-4700-9775-2c0496f538b5-00-xj1lxiwm6i6j.kirk.replit.dev”) is not allowed. To allow this host, add “ca4aedd4-fa44-4700-9775-2c0496f538b5-00-xj1lxiwm6i6j.kirk.replit.dev” to `server.allowedHosts` in vite.config.js.

After doing this, still not working

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**Author:** ![franky](https://yyz2.discourse-cdn.com/flex010/user_avatar/replit.discourse.group/franky/32/806_2.png) [@franky](https://replit.discourse.group/u/franky)\
**Post date:** [February 12, 2025, 11:53pm UTC](https://replit.discourse.group/t/help-application-cannot-start-again/3649/2 "2025-02-12T23:53:09Z")

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can you rollback with git?

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<div class="post-metadata">

**Author:** ![onechimad](https://yyz2.discourse-cdn.com/flex010/user_avatar/replit.discourse.group/onechimad/32/821_2.png) [@onechimad](https://replit.discourse.group/u/onechimad)\
**Post date:** [February 13, 2025, 3:12am UTC](https://replit.discourse.group/t/help-application-cannot-start-again/3649/3 "2025-02-13T03:12:44Z")

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tried and it didnt work either

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**Author:** ![maidway](https://avatars.discourse-cdn.com/v4/letter/m/d07c76/32.png) [@maidway](https://replit.discourse.group/u/maidway)\
**Post date:** [February 20, 2025, 7:43pm UTC](https://replit.discourse.group/t/help-application-cannot-start-again/3649/4 "2025-02-20T19:43:15Z")

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Same error. Is driving me crazy. Restore does not help.

From another user. Tell Assistant this:

`Add allowedHosts: true to the vite.ts for the server config`

It worked right away for me.