From ed09b8d3257e21a6ff07eedc60ced6be7515336b Mon Sep 17 00:00:00 2001 From: Nic <123965403+ngayerie@users.noreply.github.com> Date: Thu, 4 Dec 2025 15:13:58 +0000 Subject: [PATCH 1/2] [Errors] Update explanation for Cloudflare error 522 Clarified the SYN retry intervals for HTTP error 522. --- .../http-status-codes/cloudflare-5xx-errors/error-522.mdx | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/content/docs/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/error-522.mdx b/src/content/docs/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/error-522.mdx index 08421d7e555910c..8c97dbcbdccc27d 100644 --- a/src/content/docs/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/error-522.mdx +++ b/src/content/docs/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/error-522.mdx @@ -12,7 +12,7 @@ Error `522` occurs when Cloudflare times out contacting the origin web server. Two different timeouts cause HTTP error `522` depending on when they occur between Cloudflare and the origin web server: -- Before a connection is established, the origin web server does not return a SYN+ACK to Cloudflare within 19 seconds of Cloudflare sending a SYN. +- Before a connection is established, the origin web server does not return a SYN+ACK to Cloudflare within 19 seconds of Cloudflare sending a SYN. (the SYN retry intervals are 1 + 1 + 1 + 1 + 1 + 2 + 4 + 8) - After a connection is established, the origin web server does not acknowledge (ACK) Cloudflare's resource request within 90 seconds. ### Resolution From 92603186db7046915db318c239b0f209b9580937 Mon Sep 17 00:00:00 2001 From: Nic <123965403+ngayerie@users.noreply.github.com> Date: Thu, 4 Dec 2025 15:16:37 +0000 Subject: [PATCH 2/2] Clarify SYN retry intervals in error 522 documentation --- .../http-status-codes/cloudflare-5xx-errors/error-522.mdx | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/content/docs/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/error-522.mdx b/src/content/docs/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/error-522.mdx index 8c97dbcbdccc27d..b5d88a07556d55c 100644 --- a/src/content/docs/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/error-522.mdx +++ b/src/content/docs/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/error-522.mdx @@ -12,7 +12,7 @@ Error `522` occurs when Cloudflare times out contacting the origin web server. Two different timeouts cause HTTP error `522` depending on when they occur between Cloudflare and the origin web server: -- Before a connection is established, the origin web server does not return a SYN+ACK to Cloudflare within 19 seconds of Cloudflare sending a SYN. (the SYN retry intervals are 1 + 1 + 1 + 1 + 1 + 2 + 4 + 8) +- Before a connection is established, the origin web server does not return a SYN+ACK to Cloudflare within 19 seconds of Cloudflare sending a SYN. (the SYN retry backoff scheme is 1,1,1,1,1,2,4,8) - After a connection is established, the origin web server does not acknowledge (ACK) Cloudflare's resource request within 90 seconds. ### Resolution