HTTP 509 (Bandwidth Limit Exceeded): meaning and handling

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: HTTP 509 is not standardized; hosting control panels commonly use it for an account bandwidth quota limit.

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HTTP_STATUS_LOOP_DETECTED	HTTP_STATUS_NOT_EXTENDED

HTTP_STATUS_BANDWIDTH_LIMIT_EXCEEDED

The status is most often associated with a hosting account whose transfer allocation has been exhausted. Its exact behavior is vendor-defined and is not part of the IANA HTTP registry.

Check the hosting provider dashboard, account-level bandwidth accounting, cached or abusive traffic, and the reset period. Application code changes will not help until the provider-side quota is addressed.

Since 509 has no standard HTTP semantics, clients cannot assume that every server uses it for the same condition. On hosting platforms that use it for transfer quotas, recovery normally requires the quota window to reset or the account limit to be changed. The response body and hosting provider documentation are the authoritative clues.

cPanel: HTTP 509 Bandwidth Limit Exceeded

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