Hi Today I started to get this problem. Linie 29140: Jul 29 18:47:09 haproxyxmail01 haproxy[1010]: 192.168.y.65:26570 [29/Jul/2023:18:47:09.605] FrontEnd_Xmail_L7_IPv4~ FrontEnd_Xmail_L7_IPv4/<NOSRV> -1/-1/-1/-1/0 503 108 - - SC-- 10/10/0/0/0 0/0 "HEAD https://mail.domin.com/OAB/857f4bf9-4f97-466c-a337-6316b1aa3cc8/oab.xml HTTP/2.0<https://mail.domin.com/OAB/857f4bf9-4f97-466c-a337-6316b1aa3cc8/oab.xml%20HTTP/2.0>"
If I understand the error correctly, it says that it do not find a match for a backend or is this correct, and if so why, because there is a match?? "Mail.domain.com" is the correct FQDN just change here. The only different is it ends on http/2.0 Where all the request that works is http/1.1 which fits as Exchange do not support 2.0 but only 1.1 But what make it strange is when I try to debug with Fiddler the problem goes away, and all works, when I turn of Fiddler the problem starts again. But why this problem now and any ideas how to fix it. I am running HAproxy 2.8.1 under Ubuntu 22.04 (Full updated) and updated some days ago to 2.8.1. Here is the Frontend config frontend FrontEnd_Xmail_L7_IPv4 mode http option socket-stats timeout tarpit 10s # Allow Exchange Admin Center to certain private network only acl From_private_network src 10.0.0.0/8 192.168.y.0/24 bind 10.x.x.x:80 bind 10.x.x.x:443 ssl crt /etc/haproxy/crt/mail_domain_com.pem acl Client_Certificate_Accepted always_true http-response set-header X-Frame-Options SAMEORIGIN http-response set-header X-Content-Type-Options nosniff http-response set-header Strict-Transport-Security max-age=63072000 acl XMail hdr(host) -i mail.domian.com autodiscover.domain.com http-request tarpit deny_status 404 if !XMail http-request redirect scheme https code 301 if !{ ssl_fc } acl XMail_Autodiscover url_beg -i /autodiscover acl XMail_EAS url_beg -i /microsoft-server-activesync acl XMail_ECP url_beg -i /ecp acl XMail_EWS url_beg -i /ews acl XMail_MAPI url_beg -i /mapi acl XMail_OAB url_beg -i /oab acl XMail_OWA url_beg -i /owa acl XMail_RPC url_beg -i /rpc acl XMail_PowerShell url_beg -i /powershell acl XMail_NotAllowed url_beg -i / use_backend HA_DAG_XMail_Autodiscover if XMail XMail_Autodiscover #( From_private_network || Client_Certificate_Accepted ) use_backend HA_DAG_XMail_EAS if XMail XMail_EAS Client_Certificate_Accepted use_backend HA_DAG_XMail_ECP if XMail XMail_ECP From_private_network use_backend HA_DAG_XMail_EWS if XMail XMail_EWS From_private_network use_backend HA_DAG_XMail_MAPI if XMail XMail_MAPI From_private_network use_backend HA_DAG_XMail_OAB if XMail XMail_OAB From_private_network use_backend HA_DAG_XMail_OWA if XMail XMail_OWA From_private_network Client_Certificate_Accepted use_backend HA_DAG_XMail_RPC if XMail XMail_RPC From_private_network use_backend HA_DAG_XMail_PowerShell if XMail XMail_PowerShell From_private_network Regards Henning