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DKirschner
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Joined Feb 28, 2023
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Re: Connection refused when OnPrem is Offline
Hello Rana, thank you for your answer. I'm not sure, but I probably didn't express myself precisely enough. I think you misunderstood the problem. The problem does not occur when I send mails, but when I receive mails (or not). I'll try to describe it again in more detail: Let's assume I am company A with domain_a.com. I have two customers, company B with domain_b.com and company C with domain_c.com. Company B runs its own mail server. Company C is also on Exchange Online. Both companies can send me mails normally in regular hybrid mode. However, as soon as the OnPrem is off, I no longer receive mails from Company C with the error message mentioned. Since the mails have to come to my mail gateway first according to MX, the problem should have nothing to do with my connectors (I have two of them), right? I have not activated any transport rules.2.5KViews0likes0CommentsConnection refused when OnPrem is Offline
Hello, we have a problem with the following configuration: we have a hybrid setup and all mailboxes are already on Exchange Online. The mails go via MX to a local mail gateway, which checks the mails for spam and then forwards them to Exchange Online. This works great so far. We would like to switch off the HybridSetup soon. For this purpose we have switched off the OnPrem Exchange for a short time. This has led to the fact that we have received no more mails from other Exchange Online tenants. The senders received the following error message: 2/28/2023 9:24:58 AM - Server at xyz.PROD.OUTLOOK.COM returned '550 5.4.316 Message expired, connection refused(Socket error code 10061)' 2/28/2023 9:20:16 AM - Server at mydomain.de (mySophosIP) returned '450 4.4.316 Connection refused [Message=Socket error code 10061] [LastAttemptedServerName=myDomain.de] [LastAttemptedIP=mySophosIP:25] [SmtpSecurity=-2;-2] [xyz.prod.protection.outlook.com 2023-02-28T09:20:17.672Z 08DB1932D1917656](Socket error code 10061)' All other mail continued to go through without a problem. After we restarted the local Exchange, all mails went through again without a problem. What is happening that we could not get mails from Exchange Online Tenants anymore? Is this due to the hybrid setup and would it automatically resolve when we dissolve the setup? Or does it have something to do with the contruction of the external MX? Thanks for any advice.2.8KViews0likes2Comments
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