[Answers](https://scrapfly.io/blog)   /  [curl](https://scrapfly.io/blog/tag/curl)   /  [How to Solve the cURL (60) Error When Using Proxy?](https://scrapfly.io/blog/answers/how-to-solve-the-curl-60-error-when-proxy)   # How to Solve the cURL (60) Error When Using Proxy?

 by [Mazen Ramadan](https://scrapfly.io/blog/author/mazen) Apr 18, 2026 1 min read [\#curl](https://scrapfly.io/blog/tag/curl) [\#proxies](https://scrapfly.io/blog/tag/proxies) 

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The cURL (60) error is a common error encountered when using proxies with cURL. The full error traceback looks like the following:

bash```bash
curl: (60) schannel: SEC_E_UNTRUSTED_ROOT (0x80090325) - The certificate chain was issued by an authority that is not trusted.
More details here: https://curl.se/docs/sslcerts.html

curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it.
```



This error happens when cURL attempts to request a web page over the HTTPs protocol with a proxy server that doesn't have a valid TLS certificate. Hence, it fails to establish a secure connection.

To solve the cURL (60) error, you can use a proxy that has a valid TLS certificate to support the HTTPs protocol. Alternatively, you can omit establishing the secure connection by adding the `-k` cURL option:

bash```bash
curl -x https://proxy_domain.com:proxy_port https://httpbin.dev/ip -k
```



For further details on proxies, including their types and best practices when choosing a proxy, refer to our introduction guide.

[The Complete Guide To Using Proxies For Web ScrapingIntroduction to proxy usage in web scraping. What types of proxies are there? How to evaluate proxy providers and avoid common issues.](https://scrapfly.io/blog/posts/introduction-to-proxies-in-web-scraping)



 

    



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