# Blockcerts-verifier demo: This site can’t be reached

**URL:** <https://community.blockcerts.org/t/blockcerts-verifier-demo-this-site-can-t-be-reached/3092>\
**Category:** Support\
**Created:** [February 17, 2022, 9:35am UTC](https://community.blockcerts.org/t/blockcerts-verifier-demo-this-site-can-t-be-reached/3092 "2022-02-17T09:35:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Natalya](https://avatars.discourse-cdn.com/v4/letter/n/4da419/32.png) [@Natalya](https://community.blockcerts.org/u/Natalya)\
**Post date:** [February 17, 2022, 9:35am UTC](https://community.blockcerts.org/t/blockcerts-verifier-demo-this-site-can-t-be-reached/3092/1 "2022-02-17T09:35:36Z")

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Hello!

Can anyone help me solve the problem: when I’ try to run the blockcerts-verifier demo…

 ![image](https://us1.discourse-cdn.com/flex016/uploads/blockcerts/original/1X/412266186bd70e647313d527ee3d89761a380305.png)

…it opens [https://0.0.0.0:8081/](https://0.0.0.0:8081/) labeled “This site can’t be reached”. What is the reason for this?  
I tried to switch off my firewall - same thing.

And if it is important: eslint-config-standard-with-typescript and wc-sass-render have been installed up to date since the versions (20.0.0 and 1.0.0 respectively) specified in the blockcerts package gave errors during installation.

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**Author:** ![lemoustachiste](https://avatars.discourse-cdn.com/v4/letter/l/7c8e57/32.png) [@lemoustachiste](https://community.blockcerts.org/u/lemoustachiste)\
**Post date:** [February 28, 2022, 2:42pm UTC](https://community.blockcerts.org/t/blockcerts-verifier-demo-this-site-can-t-be-reached/3092/2 "2022-02-28T14:42:02Z")

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I don’t have access to a windows machine so let’s see if I can help you troubleshoot the issue.

- If you create a directory somewhere with just and index.html and then use something similar as this: [https://appdividend.com/2022/01/29/python-simplehttpserver/](https://appdividend.com/2022/01/29/python-simplehttpserver/) on your machine, does it work?
- the dev server is served under https, is there maybe something blocking https localhost on your machine? I suppose you can edit the `rollup.config.js` file to remove the HTTPS. It might not work as expected after, but if you see the UI then that would be isolating the issue to HTTPS.

As for the dependencies, could you maybe report the errors on the blockcerts-verifier repo? Thanks