Hybrid on-prem connector - Won't validate - Backlog of emailsWindows XP motherboard upgrade - won't allow user to validate installationWhy won't any unopened emails sync with my iPhone or Android from our Exchange 2003 serverEmail from my Google Apps domain to a specific server is being regularly truncatedExchange Connector Won't Send to External DomainsExchange 2003 SMTP does not receive RCPT from senderAll External Mail to Office 365 Fails SPF, Marked as Junk by EOP in a Hybrid DeploymentExchange 2007 - Sending spam from MY domain but invalid, random usersO365 user not receiving ANY external emails and SOME internal emails after migration to O365 (hybrid env w/Exch 2010)MT4 on my VPS won't send emails until I manually connect the RDPIn a hybrid exchange environment, how to send email from a mailbox in exchange on-prem to another mail box in exchange online?
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Hybrid on-prem connector - Won't validate - Backlog of emails
Windows XP motherboard upgrade - won't allow user to validate installationWhy won't any unopened emails sync with my iPhone or Android from our Exchange 2003 serverEmail from my Google Apps domain to a specific server is being regularly truncatedExchange Connector Won't Send to External DomainsExchange 2003 SMTP does not receive RCPT from senderAll External Mail to Office 365 Fails SPF, Marked as Junk by EOP in a Hybrid DeploymentExchange 2007 - Sending spam from MY domain but invalid, random usersO365 user not receiving ANY external emails and SOME internal emails after migration to O365 (hybrid env w/Exch 2010)MT4 on my VPS won't send emails until I manually connect the RDPIn a hybrid exchange environment, how to send email from a mailbox in exchange on-prem to another mail box in exchange online?
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We're having an issue with our on-prem Exchange 2016 validating as a connector with our O365 portal, below error;
450 4.4.316 Connection refused [Message=Socket error code 10061] [LastAttemptedServerName=hybrid.X.com] [LastAttemptedIP=X.X.X.X:25] [X.eop-eur04.prod.protection.outlook.com]
I believe this is something to do with the SMTP port itself but I'm not all that savvy with the infrastructure yet. Is there anything obvious to look out for? We have a backlog of 2500 emails waiting to go but it appears this is causing the issue.
windows exchange
asked May 13 at 19:36
Jordan AlexanderJordan Alexander
1
add a comment |
We're having an issue with our on-prem Exchange 2016 validating as a connector with our O365 portal, below error;
450 4.4.316 Connection refused [Message=Socket error code 10061] [LastAttemptedServerName=hybrid.X.com] [LastAttemptedIP=X.X.X.X:25] [X.eop-eur04.prod.protection.outlook.com]
I believe this is something to do with the SMTP port itself but I'm not all that savvy with the infrastructure yet. Is there anything obvious to look out for? We have a backlog of 2500 emails waiting to go but it appears this is causing the issue.
windows exchange
asked May 13 at 19:36
Jordan AlexanderJordan Alexander
1
add a comment |
We're having an issue with our on-prem Exchange 2016 validating as a connector with our O365 portal, below error;
450 4.4.316 Connection refused [Message=Socket error code 10061] [LastAttemptedServerName=hybrid.X.com] [LastAttemptedIP=X.X.X.X:25] [X.eop-eur04.prod.protection.outlook.com]
I believe this is something to do with the SMTP port itself but I'm not all that savvy with the infrastructure yet. Is there anything obvious to look out for? We have a backlog of 2500 emails waiting to go but it appears this is causing the issue.
windows exchange
asked May 13 at 19:36
Jordan AlexanderJordan Alexander
1
We're having an issue with our on-prem Exchange 2016 validating as a connector with our O365 portal, below error;
450 4.4.316 Connection refused [Message=Socket error code 10061] [LastAttemptedServerName=hybrid.X.com] [LastAttemptedIP=X.X.X.X:25] [X.eop-eur04.prod.protection.outlook.com]
I believe this is something to do with the SMTP port itself but I'm not all that savvy with the infrastructure yet. Is there anything obvious to look out for? We have a backlog of 2500 emails waiting to go but it appears this is causing the issue.
windows exchange
windows exchange
asked May 13 at 19:36
Jordan AlexanderJordan Alexander
1
asked May 13 at 19:36
Jordan AlexanderJordan Alexander
1
asked May 13 at 19:36
Jordan AlexanderJordan Alexander
1
asked May 13 at 19:36
Jordan AlexanderJordan Alexander
1
asked May 13 at 19:36
Jordan AlexanderJordan Alexander
1
1
add a comment |
add a comment |
1 Answer
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Did you get any error message when you run HCW?
According to the error message, yes, a likely cause for this error is your firewall is blocking connections from Office 365 IP addresses.
If you have mailboxes in your on-premises environment, you need to modify your firewall settings to allow connections from Office 365 IP addresses on TCP port 25 to your on-premises email servers. For a list of the Office 365 IP addresses, see Office 365 URLs and IP address ranges.
Similar thread:
https://social.technet.microsoft.com/Forums/en-US/ef63dcb2-b814-4638-964c-ef5fc75612df/message-delayed-with-450-44316-connection-refused?forum=onlineservicesexchange
answered May 14 at 2:16
Jayce YangJayce Yang
1394
add a comment |
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1 Answer
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1 Answer
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Did you get any error message when you run HCW?
According to the error message, yes, a likely cause for this error is your firewall is blocking connections from Office 365 IP addresses.
If you have mailboxes in your on-premises environment, you need to modify your firewall settings to allow connections from Office 365 IP addresses on TCP port 25 to your on-premises email servers. For a list of the Office 365 IP addresses, see Office 365 URLs and IP address ranges.
Similar thread:
https://social.technet.microsoft.com/Forums/en-US/ef63dcb2-b814-4638-964c-ef5fc75612df/message-delayed-with-450-44316-connection-refused?forum=onlineservicesexchange
answered May 14 at 2:16
Jayce YangJayce Yang
1394
add a comment |
Did you get any error message when you run HCW?
According to the error message, yes, a likely cause for this error is your firewall is blocking connections from Office 365 IP addresses.
If you have mailboxes in your on-premises environment, you need to modify your firewall settings to allow connections from Office 365 IP addresses on TCP port 25 to your on-premises email servers. For a list of the Office 365 IP addresses, see Office 365 URLs and IP address ranges.
Similar thread:
https://social.technet.microsoft.com/Forums/en-US/ef63dcb2-b814-4638-964c-ef5fc75612df/message-delayed-with-450-44316-connection-refused?forum=onlineservicesexchange
answered May 14 at 2:16
Jayce YangJayce Yang
1394
add a comment |
Did you get any error message when you run HCW?
According to the error message, yes, a likely cause for this error is your firewall is blocking connections from Office 365 IP addresses.
If you have mailboxes in your on-premises environment, you need to modify your firewall settings to allow connections from Office 365 IP addresses on TCP port 25 to your on-premises email servers. For a list of the Office 365 IP addresses, see Office 365 URLs and IP address ranges.
Similar thread:
https://social.technet.microsoft.com/Forums/en-US/ef63dcb2-b814-4638-964c-ef5fc75612df/message-delayed-with-450-44316-connection-refused?forum=onlineservicesexchange
answered May 14 at 2:16
Jayce YangJayce Yang
1394
Did you get any error message when you run HCW?
According to the error message, yes, a likely cause for this error is your firewall is blocking connections from Office 365 IP addresses.
If you have mailboxes in your on-premises environment, you need to modify your firewall settings to allow connections from Office 365 IP addresses on TCP port 25 to your on-premises email servers. For a list of the Office 365 IP addresses, see Office 365 URLs and IP address ranges.
Similar thread:
https://social.technet.microsoft.com/Forums/en-US/ef63dcb2-b814-4638-964c-ef5fc75612df/message-delayed-with-450-44316-connection-refused?forum=onlineservicesexchange
answered May 14 at 2:16
Jayce YangJayce Yang
1394
answered May 14 at 2:16
Jayce YangJayce Yang
1394
answered May 14 at 2:16
Jayce YangJayce Yang
1394
answered May 14 at 2:16
Jayce YangJayce Yang
1394
1394
add a comment |
add a comment |
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