The following error is being generated from Systems Center. We also receive the error for port 587. We route all of our email through an appliance and do not use the FrontEnd Transport. To get rid of these annoying alerts Should I disable these with an override? Or is there a better way?

The inbound proxy probe failed 3 times over 15 minutes.
Server 127.0.0.1 on
port 25 did not respond with expected response (OK). The actual response was:
451 4.7.0 Temporary server error. Please try again later. PRX2
.
Probe
Exception: 'System.Exception: Server 127.0.0.1 on port 25 did not respond with
expected response (OK). The actual response was: 451 4.7.0 Temporary server
error. Please try again later. PRX2
.
at
Microsoft.Forefront.Monitoring.ActiveMonitoring.Smtp.Probes.SmtpConnectionProbe.AssertExpectedResponse(SmtpExpectedResponse
expectedResponse)
at
Microsoft.Forefront.Monitoring.ActiveMonitoring.Smtp.Probes.SmtpConnectionProbe.TestConnection()
at
Microsoft.Forefront.Monitoring.ActiveMonitoring.Smtp.Probes.SmtpConnectionProbe.DoWork(CancellationToken
cancellationToken)
at
Microsoft.Office.Datacenter.WorkerTaskFramework.WorkItem.Execute(CancellationToken
joinedToken)
at
Microsoft.Office.Datacenter.WorkerTaskFramework.WorkItem.<>c__DisplayClass2.<StartExecuting>b__0()
at
System.Threading.Tasks.Task.Execute()'
Failure Context: 'Server 127.0.0.1 on
port 25 did not respond with expected response (OK). The actual response was:
451 4.7.0 Temporary server error. Please try again later. PRX2

.'
Execution Context: ''
Probe Result Name:
'OnPremisesInboundProxy'
Probe Result Type: 'Failed'
Monitor Total Value:
'3'
Monitor Total Sample Count: '3'
Monitor Total Failed Count:
'0'
Monitor Poisoned Count: '0'
Monitor First Alert Observed Time:
'2/22/2015 9:29:53 AM'

Hi,

According to your description, I noticed that you route all of our email through an appliance and do not use the FrontEnd Transport. Please disable it and run the following command to check whether there is any third-party agent:

Get-TransportAgent

Please disable all third-party agents and applications. Then restart "Microsoft Frontend Transport" and "Microsoft Exchange Transport" services to have a try.

Additionally, here is a similar thread for your reference:

https://social.technet.microsoft.com/Forums/exchange/en-US/fc26dac5-d4e2-49da-903d-361ea8b85388/451-470-temporary-server-error-please-try-again-later-prx5

Regards,

Since I'm not using the Frontend Transport can I disable the monitoring. If so, how?

Since I'm not using the Frontend Transport can I disable the monitoring. If so, how?

Hi,

Sorry for my delay. Have the issue been resolved?

I suggest we can disable the third-party application and only use the Frontend Transport to send the message and check whether the issue persists. This test can narrow down the issue to the third-party problem or the Exchange mail flow issue.

Regards,