> ## Documentation Index
> Fetch the complete documentation index at: https://docs.roundproxies.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Error Handling

> Common errors you may encounter when using ISP Proxies and how to resolve them.

When using Roundproxies ISP proxies, you may run into errors from the proxy network or the target site. The tables below summarize the most common ones, what they mean, and how to fix them.

## Authentication Errors

| Error                               | Meaning                                       | Fix                                                                                                                                                                                       |
| ----------------------------------- | --------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `407 Proxy Authentication Required` | Credentials missing, malformed, or incorrect. | Verify credentials in the [dashboard](https://app.roundproxies.com/dashboard/isp). If using IP whitelisting, confirm your current IP is added. See [Authentication](/isp/authentication). |
| `401 Unauthorized`                  | Account recognized but request not allowed.   | Confirm your subscription is active and your plan includes the requested ISP proxies.                                                                                                     |

## Connection Errors

| Error                          | Meaning                                     | Fix                                                                                           |
| ------------------------------ | ------------------------------------------- | --------------------------------------------------------------------------------------------- |
| `Connection Timed Out`         | The proxy didn't respond in time.           | Retry the request. If one specific IP keeps timing out, replace it from the dashboard.        |
| `Connection Refused` / `Reset` | Connection rejected or dropped mid-request. | Check firewall/outbound rules and confirm you're using the correct port from your proxy list. |

## IP Errors

| Error                   | Meaning                                          | Fix                                                                                                                                                         |
| ----------------------- | ------------------------------------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `IP Banned by Target`   | The destination site has blocked your static IP. | Replace the IP from the dashboard. This is rarer than with datacenter IPs since ISP IPs look residential, but heavy use on one target can still trigger it. |
| `Static IP Unavailable` | Your dedicated IP is offline or being replaced.  | Wait a few minutes and retry — replacements happen automatically. Contact support if it persists.                                                           |

## HTTP Status Errors From the Target Site

These come from the destination website, not the proxy itself.

| Error                   | Meaning                               | Fix                                                                             |
| ----------------------- | ------------------------------------- | ------------------------------------------------------------------------------- |
| `403 Forbidden`         | Site is blocking the request.         | Slow down, vary your request patterns, or spread the load across more IPs.      |
| `429 Too Many Requests` | Site is rate-limiting your IP.        | Reduce the request rate — a static IP can't rotate its way out of a rate limit. |
| `5xx`                   | Server-side error on the target site. | Retry with exponential backoff.                                                 |

## Quota / Billing Errors

| Error          | Meaning                        | Fix                                                                                                                           |
| -------------- | ------------------------------ | ----------------------------------------------------------------------------------------------------------------------------- |
| `Plan Expired` | Your ISP proxy plan has ended. | Renew the plan in the [dashboard](https://app.roundproxies.com) — your IPs are held for a grace period before being released. |

## Still stuck?

Reach out at [team@roundproxies.com](mailto:team@roundproxies.com) or visit the [Help Center](https://help.roundproxies.com/en).