--doctor is a command-line utility that you can use to troubleshoot and diagnose issues with Sauce Connect Proxy. This topic describes how to read the --doctor log and how to resolve errors that --doctor detects.

See the following sections for more information:

Running Tests Using the --doctor Flag as a Diagnostics Tool

When running Sauce Labs tests with Sauce Connect Proxy, there may be situations in which Sauce Connect Proxy doesn't perform as expected. To make sure everything is in working order, you can run Sauce Connect diagnostic tests by appending the --doctor flag to your command-line, like so:

sc -u [Your Sauce Username] -k [Your Sauce Access Key] --doctor

--doctor will run a series of diagnostic operations to verify the following:

 Sauce Username]/tunnels

NOTE: Sauce Connect will exit after these checks are performed. A tunnel will not be started.

Identifying and Resolving Common Errors with the --doctor Flag

In the table below, you'll find descriptions of the errors that --doctor will detect and how to resolve them. 


failed to fetch PAC file ...: ...

Indicates the specified PAC file couldn't be downloaded. This may be caused by an incorrect URL, or a network mis-configuration. To troubleshoot this type of issue, try to download the PAC file manually from the machine running Sauce Connect with cURL or another HTTP client.

To debug the PAC file you can create one locally and pass it to Sauce Connect Proxy using the --pac option like this:

$ sc --pac file:///path/to/pacfile.js

In Windows, remember to add the drive to the path like this:

$ sc --pac file://C:/path/to/pacfile.js

failed to fetch or empty PAC file ...

Connection to the remote server was successful, but the PAC file was empty or missing.

both --proxy and --pac are used

Using both may work, but this is unsupported by Sauce Labs and should only be used if directed by the Sauce Labs support.

invalid REST URL ...

URL specified in the -x option is invalid.

failed to find proxy via PAC for ...

PAC file was downloaded successfully, but no proxy was found for this host. This may be the result of an incorrect PAC file: make sure a proxy is specified for all the hosts.

can't resolve 'saucelabs.com'/... tunnel hostname(s) via any DNS server

Please check your firewall and DNS settings.

To troubleshoot this issue, use dig or host to resolve the domain and verify it is correct:

$ dig saucelabs.com

your hosts file contains an entry for ...

DNS server can't resolve saucelabs.com correctly. This is most likely because the DNS system has a special configuration for some hosts. We strongly recommend you remove this entry from the host file: it's usually /etc/hosts on Unix-like systems. With Linux/Mac OS X systems, you can check the hosts file with this command.

$ grep 'saucelabs.com' /etc/hosts

connecting via <proxy> to http://<url>: <error> or connecting to http://<url>: <error>

URL isn't accessible. If you see this error after other errors in the logs, try to fix the previous errors first.

Please refer to the libcurl errors manual to troubleshoot this issue.

SSL connect failed, socket: ... code: %d

Secure connection couldn't be established. Please refer to the OpenSSL manual to get more information about the error.

failed to retrieve certificate chain

Some X509 certificates couldn't be imported into the SSL library. This may indicate an issue with DNS, or public CAs being unreachable.

failed to reach https?://google.com

Sauce Connect client can't reach google.com. This indicates that the client doesn't have full Internet connectivity. It may not be an issue; Sauce Connect only needs access to saucelabs.com and its tunnels.

Need More Help?

Most common Sauce Connect Proxy test errors can be detected and resolved using the guidelines in this troubleshooting section, however, should you require additional assistance, please get in touch with our support team at help@saucelabs.com.

To better assist you, when creating your support ticket, please include the following information with your request:

sc -u [Your Sauce Username] -k [Your Sauce Access Key] -vv -l sc.log

Then, attach the resulting sc.log file to your support request.

More Information