![SCOM: Report Subscription “Failure sending mail: The transport failed to connect to the server” | Discuss IT Now - Microsoft Operations Manager: Manage Everything SCOM: Report Subscription “Failure sending mail: The transport failed to connect to the server” | Discuss IT Now - Microsoft Operations Manager: Manage Everything](https://discussitnow.files.wordpress.com/2009/12/srsconfigtool5b55d.png)
SCOM: Report Subscription “Failure sending mail: The transport failed to connect to the server” | Discuss IT Now - Microsoft Operations Manager: Manage Everything
![Mail loop between Hybrid and legacy server. 421 4.2.1 Unable to connect or 451 4.4.397 Error communicating with target host or 451 4.7.0 Temporary server error – Modern 365 Mail loop between Hybrid and legacy server. 421 4.2.1 Unable to connect or 451 4.4.397 Error communicating with target host or 451 4.7.0 Temporary server error – Modern 365](https://praveenkumare.files.wordpress.com/2021/07/1.png)
Mail loop between Hybrid and legacy server. 421 4.2.1 Unable to connect or 451 4.4.397 Error communicating with target host or 451 4.7.0 Temporary server error – Modern 365
Nilesh Gajjar - Business Central & NAV: Dynamics NAV Error : The SMTP mail system returned the following error: "Failure sending mail. Unable to read data from the transport connection: net_io_connectionclosed."
![c# - goDaddy SMTP-Unable to read data from the transport connection: net_io_connectionclosed - Stack Overflow c# - goDaddy SMTP-Unable to read data from the transport connection: net_io_connectionclosed - Stack Overflow](https://i.stack.imgur.com/3KKM7.png)