From Support
22001 No free handles
22002 Cannot allocate memory
22003 Not session owner
22004 Cannot initialize network
22005 Invalid host name
22006 Cannot create socket
22007 Cannot accept connection
22008 Cannot connect to server
22009 Cannot get peer information
22010 Cannot bind socket
22011 Cannot listen for connection
22012 Invalid parameter passed to function
22013 Invalid handle passed to function
22014 Cannot select socket
22015 Cannot read socket
22016 Cannot write socket
22017 End of data
22018 Connection in use
22019 Connection not in use
22020 Timeout on socket operation"
22021 Internal synchronization error
22022 Remote server closed connection
22023 Remote server is not ready, try again
22024 Remote server is not available
22025 Unknown problem with remote server
22026 Unable to create data connection
22027 Data connection already open
22028 Data connection is closed
22029 File transfer aborted
22030 Data connection is read-only
22031 Data connection is write-only
22032 Unable to set file type
22033 Data connection is passive
22034 Cannot determine server address
22035 Cannot create local file
22036 Cannot open local file
22037 Cannot read local file
22038 Cannot write local file
22039 Cannot login to remote server
22040 Cannot open data connection
22041 Remote file unavailable
22042 Insufficient storage space
22043 Command not recognized
22044 Invalid command argument
22045 Command not implemented
22046 Invalid command sequence
22047 Not logged in on server
22048 Account required for storing files
22049 Cannot access file on server
22050 File exceeded storage allocation
22051 Invalid file name
22052 Unexpected server error
