it1270
June 12, 2023, 5:05pm
1
Hi everyone !
I need your help for a problem that i don’t understand what’s the trouble.
I’ve a subdomain subdomain.domain.com that used for both exchange online & website.
So in my dns zone I’ve three entries :
a cname record pointed to a LB (load balancing) record that point to the two public IP of our webserver
a mx record to point emails to O365 exchange
a TXT record for the spf : v=spf1 include:spf.protection.outlook.com -all
So the situation is follow :
I don’t understand why ? Can you help me ?
it1270
June 12, 2023, 5:07pm
4
here’s the full error from the O365 side :
Reason: [{LED=450 4.4.316 Connection refused [Message=Socket error code 10061] [LastAttemptedServerName=subdomain.domain.com] [LastAttemptedIP=194.xx.xx.xx] [SmtpSecurity=-2;-2] [VXXXXXX.eop-eur05.prod.protection.outlook.com 2023-06-12T10:24:33.145Z 08DB684E271E7413]};{MSG=Socket error code 10061};{FQDN=subdomain.domain.com};{IP=. OutboundProxyTargetIP: xx.xx.xx.xx. OutboundProxyTargetHostName: subdomain.domain.com
the problem here is the system uses the cname subdomain.domain.com instead the MX record from dns zone
it1270
June 12, 2023, 5:37pm
5
for information : CNAME Flattening is configured to ‘Flatten CNAME at root’
i cannot change this default value (no other option proposed)
it1270
June 13, 2023, 7:00am
6
Ok I read that cname is priority to a MX record.
But how I can resolve my problem when I use LB ?
It may be that your request for assistance is gaining no traction because it has no obvious connection to Cloudflare. You may have better luck in a forum dedicated to Microsoft 365 email.
it1270
June 20, 2023, 7:11am
11
ok thank you but I think they will answer me that it’s because I use a cname instead of an A
So, how I can use a loadbalancer with a A record ?
Thank you !
Who is they?
What is?
You should probably post your load balancer question as its own topic.
system
June 23, 2023, 11:54am
13
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