Errors Reference#

When an error occurs, Smart Proxy Manager sends a response containing an error code.

When using the Smart Proxy Manager API, the error code is returned in the X-Crawlera-Error header, with a human-readable description in the response body.

Errors can be classified into two main categories:

  • Bans. These are the errors produced when Smart Proxy Manager couldn’t find enough unblocked IPs, and are plotted in red in the Smart Proxy Manager usage stats.

  • Failures. These are all the remaining errors, some of them produced by errors on the user side and other produced by errors on Smart Proxy Manager server side. These are plotted in gray in the Smart Proxy Manager usage stats.

In both of these cases requests don’t count towards your monthly successful quota. Check out Zyte Smart Proxy Usage & Recent Requests to understand more about your Smart Proxy usage.

Note

These error codes are subject to change at any time, so they should not be relied on and only used for debugging.

Ban Errors (Not Enough Capacity)#

X-Crawlera-Error

Response Code

Error Message

How to fix or debug

banned

503

All download attempts failed. Please retry.

Trying again usually works. If you keep getting this message, you may need to consider Zyte residential proxies or Zyte API. Please contact support.

noslaves

503

No available proxies to fulfill request. Please contact support.

Trying again usually works. If you keep getting this message, you may need to consider a Smart Proxy Manager Enterprise plan with dedicated capacity. Please contact support.

Failure Errors (User Side)#

X-Crawlera-Error

Response Code

Error Message

How to fix or debug

bad_session_id

400

Bad session ID

Create a new session, this one probably expired.

user_session_limit

400

Session limit exceeded

Create less sessions or upgrade your plan.

invalid_request

400

Invalid request (typically malformed)

The client-side technology you’re using with Smart Proxy Manager may have some incompatibilities. Contact our support team for help.

regions_with_sessions_not_supported`

400

Regions with sessions not supported.

Make sure you’re not using X-Crawlera-Region and X-Crawlera-Session together.

bad_uri

401

Malformed URL

Check the URL you’re passing to Smart Proxy Manager. Contact our support team if you need help.

bad_auth

401

Incorrect authentication data

Make sure you’re using the right Smart Proxy Manager credentials.

user_suspended

403

User account suspended

Extend the overage limit in your account through the Billing section

bad_proxy_auth

407

Incorrect authentication data

Make sure you’re using the right Smart Proxy Manager credentials.

max_header_size_exceeded

413

Invalid request. Size of headers above limit of 102400 bytes.

Make sure your headers aren’t longer than the limit.

too_many_conns

429

Parallel connections limit has been reached

Reduce concurrency or upgrade your Smart Proxy Manager plan

header_auth

470

Unauthorized header

You’re using a Smart Proxy Manager header (or header value) that is not allowed in your current plan. Consider upgrading to a higher plan or contact our support team for alternatives.

header_auth

470

X-Crawlera-UA header is no longer supported, use X-Crawlera-Profile instead

X-Crawlera-UA header has been deprecated, use X-Crawlera-Profile instead.

internal_server_error

499

Connection closed by client

Check the timeout used when connecting to Smart Proxy Manager from your code. It may need to be increased. Unlike other errors, this error is not returned in the response, because it happens when the client drops the connection early, without waiting for the response. However, these errors are visible in Dash (Crawlera Stats).

Failure Errors (Server Side)#

X-Crawlera-Error

Response Code

Error Message

How to fix or debug

nxdomain

502

Domain not found

Check the domain of the URL you’re trying to fetch, it may be wrong.

ehostunreach

502

Host is unreachable

The domain you’re trying to access may be down. Contact our support team if this is not the case.

econnrefused

502

Targey website is refusing connection

Check the website works in your browser, and contact support it if does.

econnreset

502

Connection with website lost

Trying again usually works. unless the target website is having some issues. If the issue persists, contact our support team.

socket_closed_remotely

502

Target website closed the connection

Trying again usually works, unless the target website is having some issues. If the issue persists, contact our support team.

ssl_tunnel_error

502

Failed to initialize SSL tunnel (This contemplates both client SSL errors trying to connect to Smart Proxy Manager and Smart Proxy Manager trying to connect to target websites.)

Make sure you have the Smart Proxy Manager CA file installed in your trusted certificates. Contact support if you still have issues.

enetunreach

503

Network unreachable

Trying again usually works. If the issue persists, contact our support team.

serverbusy

503

Server busy: too many outstanding requests

Try again after some minutes

cannot_dispatch

503

Service Unavailable

Try again after some minutes

timeout

504

Timeout waiting for a response from the target website

Check if the URL you’re trying to access actually works, contact support if it does.

msgtimeout

504

Timeout receiving data from the target website (after the TCP connection is established)

Check if the URL works well in your browser, and contact our support team if it does.

connect_timeout

504

Timeout establishing secure tunnel to target website

Check if the URL works well in your browser, and contact our support team if it does.

domain_forbidden

523

The domain you are trying to access is restricted in SPM

Contact support to check if the restriction can be lifted

bad_header

540

Bad xheader value

Check the value you passed in the X-Crawlera header and make sure it’s valid according to the documentation.

data_error

541

Response size is too big. The maximum response size in Smart Proxy Manager is 500 Mb.

Fetch a URL that is smaller in size.

bad_endpoint

542

You’re accessing the wrong API endpoint for Smart Proxy Manager.

If you’re on an Enterprise plan, make sure you’re using your Enteprise hostname (eg. acme.crawlera.com).