525/555 若回源协议为 HTTPS ，则节点回源时需要与源站进行 SSL 握手，若握手失败，则节点响应客户端 525/555 状态码。 https://cloud.tencent.com/document/product/1552/101095 知乎走的腾讯云加速。

CDN 525 报错，CDN 与源站建连异常，且问题发生在 SSL 握手阶段。

哈哈，原来这么多人和我一样，每天的流程就是刷 FSHEX 和知乎

用 curl 简单打了下追踪： * Connected to www.zhihu.com port 443 * using HTTP/1.x > GET / HTTP/1.1 > Host: www.zhihu.com > User-Agent: curl/8.14.1 > Accept: */* > * schannel: remote party requests renegotiation * schannel: renegotiating SSL/TLS connection * schannel: SSL/TLS connection renegotiated * schannel: remote party requests renegotiation * schannel: renegotiating SSL/TLS connection * schannel: SSL/TLS connection renegotiated * Request completely sent off < HTTP/1.1 525 EO errCode : SSL handshake failed < Server: EdgeOne_IS_OC < Content-Length: 0 < Connection: keep-alive < Date: Fri, 17 Oct 2025 02:06:59 GMT < alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000,h3-Q050=":443"; ma=2592000,quic=":443"; ma=2592000; v="46,43" < EO-LOG-UUID: 12789637950738548018 * The requested URL returned error: 525 < * closing connection #0 估计是源站 SLB 炸了？

curl -vv -6 https://www.zhihu.com * About to connect() to www.zhihu.com port 443 (#0) * Trying 240e:cf:9000:321:37::13... * Connected to www.zhihu.com (240e:cf:9000:321:37::13) port 443 (#0) * Initializing NSS with certpath: sql:/etc/pki/nssdb * CAfile: /etc/pki/tls/certs/ca-bundle.crt CApath: none * SSL connection using TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 * Server certificate: * subject: CN=*.zhihu.com,O=智者四海（北京）技术有限公司,ST=北京市,C=CN * start date: Dec 10 00:00:00 2024 GMT * expire date: Jan 10 23:59:59 2026 GMT * common name: *.zhihu.com * issuer: CN=GeoTrust G2 TLS CN RSA4096 SHA256 2022 CA1,O="DigiCert, Inc.",C=US > GET / HTTP/1.1 > User-Agent: curl/7.29.0 > Host: www.zhihu.com > Accept: */* > < HTTP/1.1 525 EO errCode : SSL handshake failed < Server: EdgeOne_IS_OC < Content-Length: 0 < Connection: keep-alive < Date: Fri, 17 Oct 2025 02:08:16 GMT < alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000,h3-Q050=":443"; ma=2592000,quic=":443"; ma=2592000; v="46,43" < EO-LOG-UUID: 5273955530657146703 < * Connection #0 to host www.zhihu.com left intact

我刚去翻他们招聘发现不找运维，不稀奇

我还以为公司把知乎封了呢

10 点上班 有啥事上班再修

就靠知乎摸鱼呢。。

知乎有一段时间崩的特别厉害，最后慢慢从 Python -> Go