Error

A message sent to adapter "BiztalkMessagingEngine" on send port "XX.FMA.Extract_1.0.0.0_XX.FMA.Extract.SendExtract_DynamicFTP_f136abb33540170c" with URI "ftp://1.2.3.101:21/%SourceFileName%" is suspended. 
 Error details: Unknown Error Description  
 MessageId:  {28F29FA5-18EF-4FE7-B6CC-E03F4E2AA26F}
 InstanceID: {C09E16A5-11AB-46AF-980A-7826772EEF0B}

Background

We moved code to a new target environment, where the Host-Instances didn’t match the source environment. We reconfigured some of the HostInstances to allow for a default 32-bit host instance, then restarted the Host Instances.

Orchestration is being used to send files to a dynamic FTP. We store the FTP site, user, password in a SQL table to allow us send to many different FTP trading partners.

Solution

Unenlist and re-start the dynamic send port. Apparently restarting the Host Instances was not enough.

This is the site that helped me resolved it:
http://social.msdn.microsoft.com/Forums/en-US/68bd1ced-819b-4c7e-beca-185761f7dd8f/error-transmitting-message-to-ftp-server-using-esb-toolkit-adapter-providers?forum=biztalkesb