> For the complete documentation index, see [llms.txt](https://docs.portainer.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.portainer.io/faqs/troubleshooting/access-and-authentication/client-sent-an-http-request-to-an-https-server.md).

# Client sent an HTTP request to an HTTPS server

#### Issue Description

When accessing Portainer via the web you may receive the following error message:

```
Client sent an HTTP request to an HTTPS server.
```

#### Cause

This error occurs when you attempt to access Portainer's HTTPS URL (port 9443) using the HTTP protocol:

```
http://my.portainer.url:9443/
```

This is because port 9443 only accepts the HTTPS protocol and does not accept HTTP requests.

#### Resolution

Use the HTTPS protocol in the address when accessing port 9443.

```
https://my.portainer.url:9443/
```

Alternatively if you have HTTP access enabled you can access via HTTP on port 9000:

```
http://my.portainer.url:9000/
```

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