Attempting to configure email server settings in Citrix Command Center throws the error: “Connection to mail server failed, provide accurate mail settings”

Problem

You’re attempting to configure the email server settings in Citrix Command Center but notice that you receive the following error when you save the configuration:

Error

Connection to mail server failed, provide accurate mail settings

Solution

While there could be several reasons why this error is thrown, one of the more common causes I’ve seen at clients is that they’ve configured their anonymous receive connector correct to receive mail but had forgotten to uncheck the Require that all senders are authenticated option:

… for the Microsoft Exchange distribution group they’ve specified in the To Address:

If Require that all senders are authenticated option for the distribution group is required to be enabled then a receive connector that requires authentication should be created and user credentials should be filled in for the Configure Email Server Settings.

Attempting to add NetScaler device to Citrix Command Center fails with: “Discovery failed for | Error: Unable to Ping using SNMP after enabling SNMP”

Problem

You’ve just completed deploying Citrix Command Center 5.2 45.4 and attempt to add your NetScaler pair to the device list but the process fails with the following error:

Discovery failed for <NSIP>

Error: Unable to Ping using SNMP after enabling SNMP

Solution

One of the reasons why this error would be thrown is if the Citrix Command Center server is unable to access the NetScaler via UDP Port 161 as shown in the following firewall log capture:

To correct the issue, simply allow UDP port 161 from the Citrix Command Center to the NetScaler and initiate the add device process again: