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Error Message:

<emailMessage date="2015-07-13 07:27:49,383" thread="[20]" level="ERROR" logger="PaperLess.MES.Logger.Handled" />

Socket Exception - Address: 192.18.81.141 System.Net.Sockets.SocketException (0x80004005): The requested name is valid, but no data of the requested type was found

at System.Net.Dns.InternalGetHostByAddress(IPAddress address, Boolean includeIPv6)

at System.Net.Dns.GetHostEntry(IPAddress address)

at PaperLess.MES.Core.Services.OperatorPanelService.OperatorPanelService.GetOperatorPanelByNameOrIPAddress(String nameOrIPAddress, Nullable`1 siteId) <emailMessage />

Cause:  

The most likely cause is a defined Operator Panel has a hostname which can no longer be resolved on your network

Resolution:

Ensure communication to all defined Operator Panels is working by pinging each one.  Also check to make sure the defined configuration of the operator panels is correct.