Over the last couple of days we have noticed an increase in Workflows being terminated on the Standard WF Email activity with an Error message of "The Operation Timed out."
Today alone thus far there has been just over 100 Workflows terminated with this error. This has been at various times in the morning and not all at once at the same time.
Here is an extract of the Error from the Activities log on the WF Server:
Timestamp: 2015-03-11 10:10:44.650
Local Time: 2015/03/11 12:10:44 PM
Category: Activity
Machine: VMISFDMSWF
Severity: Error
Application Domain: Laserfiche.Workflow.Service.exe
Process Id: 5496
Process Name: C:\Program Files\Laserfiche\Laserfiche Workflow 9\Laserfiche.Workflow.Service.exe
Win32 Thread Id: 15576 -
Thread Name:
Message: <Exception handlingInstanceId="04d587ca-707a-4639-b1fc-26b9d40d313c">
<Description>An exception of type 'System.Net.Mail.SmtpException' occurred and was caught.</Description>
<DateTime>2015-03-11 12:10:44Z</DateTime>
<ExceptionType>System.Net.Mail.SmtpException, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</ExceptionType>
<Message>The operation has timed out.</Message>
<Source>System</Source>
<HelpLink />
<Property name="StatusCode">GeneralFailure</Property>
<Property name="EmailSyncLevel">11</Property>
<Property name="InstanceId">d1991d71-6e0d-4cdb-bc90-08c5f2af5704</Property>
<Property name="ActivityName">Email_EmailWithAttachments</Property>
<Property name="TargetSite">Void Send(System.Net.Mail.MailMessage)</Property>
<Property name="HResult">-2146233088</Property>
<StackTrace> at System.Net.Mail.SmtpClient.Send(MailMessage message)
at Laserfiche.Workflow.Activities.Email.Runtime.EmailTaskExecutor.Execute(EmailTaskOptions options, TaskExecutorContext status)</StackTrace>
<additionalInfo>
<info name="MachineName" value="VMISFDMSWF" />
<info name="TimeStamp" value="2015/03/11 10:10:44 AM" />
<info name="FullName" value="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
<info name="AppDomainName" value="Laserfiche.Workflow.Service.exe" />
<info name="ThreadIdentity" value="" />
<info name="WindowsIdentity" value="NT AUTHORITY\SYSTEM" />
</additionalInfo>
</Exception>
Has anyone else seen this type of behaviour before or is there any indication what could be causing this?