Local side emergency close down

Hello,
I am testing OFTP2 1.0 build 31
When I try exchanging documents with partner (no SSL, port 3305, only SSIDPSWD) I receive an error Local side emergency close down - internal code 5.
If I test connection I see everything OK (Running OFTP service found and connection established), but when I try to send a test file there is this error:

[ :41 AM] [Connection test to .com/xxx.xxx.xxx.xxx:3305] Start connection check to .com/xxx.xxx.xxx.xxx:3305 using PLAIN connection...
[ :41 AM] [Connection test to .com/xxx.xxx.xxx.xxx:3305] Setting timeout to 2000ms
[ :41 AM] [Connection test to .com/xxx.xxx.xxx.xxx:3305] Connection to .com/xxx.xxx.xxx.xxx:3305 established successfully
[ :41 AM] [Connection test to .com/xxx.xxx.xxx.xxx:3305] Check for running OFTP service...
[ :41 AM] [Connection test to .com/xxx.xxx.xxx.xxx:3305] Start connection check to .com/xxx.xxx.xxx.xxx:3305 using PLAIN connection...
[ :41 AM] [Connection test to .com/xxx.xxx.xxx.xxx:3305] Setting timeout to 2000ms
[ :41 AM] [Connection test to .com/xxx.xxx.xxx.xxx:3305] Connection to .com/xxx.xxx.xxx.xxx:3305 established successfully
[ :41 AM] [Connection test to .com/xxx.xxx.xxx.xxx:3305] Check for running OFTP service...
[ :42 AM] [Connection test to .com/xxx.xxx.xxx.xxx:3305] Remote service identification: "IODETTE FTP READY"
[ :42 AM] [Connection test to .com/xxx.xxx.xxx.xxx:3305] Success: Running OFTP service found at .com/xxx.xxx.xxx.xxx:3305
[ :33 AM] [Transmission 8043] [Directory poll manager] The file "c:\oftp2\messages\XXX\outbox\TEST.txt" has been scheduled for preprocessing. Final receiver: "XXX", virtual filename: "NOT-CATEGORIZED"
[ :36 AM] [Transmission 8043] Starting data preprocessing [c:\oftp2\messages\XXX\outbox\pending\NOT-CATEGORIZED201708211040330018], size: 4 bytes
[ :36 AM] [Transmission 8043] The user defined transmission id is set to "--"
[ :36 AM] [Transmission 8043] Record format of the transmission: U
[ :36 AM] [Transmission 8043] Signing transfer data [c:\oftp2\messages\XXX\outbox\pending\NOT-CATEGORIZED201708211040330018]
[ :36 AM] [Transmission 8043] The transfer data has been signed using SHA1 by the key "www.XXX.net"
[ :36 AM] [Transmission 8043] Compressing transfer data [c:\oftp2\messages\XXX\outbox\pending\NOT-CATEGORIZED201708211040330018]
[ :36 AM] [Transmission 8043] Compressing transfer data finished. Old size: 568 bytes, new size: 584 bytes, ratio: 1.0
[ :36 AM] [Transmission 8043] Moved preprocessed data to [c:\oftp2\messages\XXX\outbox\pending\NOT-CATEGORIZED201708211040330018]
[ :36 AM] [Transmission 8043] Data preprocessing finished successfully, waiting for outbound transmission
[ :47 AM] Initializing outgoing connection to XXX [.com/xxx.xxx.xxx.xxx:3305]
[ :48 AM] [Session 15033055135604] Connection established [.com/xxx.xxx.xxx.xxx:3305]
............................
------------------------------------------------------------------------------
| SSID Start Session
o-------------------------------------------------------------------------------
| 0 | X(1) | SSIDCMD | SSID Command | 'X' | [58]
| 1 | 9(1) | SSIDLEV | Protocol Release Level | '5' |
| 2 | X(25) | SSIDCODE | Initiators Identification Code | 'XXX ' |
| 27 | X(8) | SSIDPSWD | Initiators Password | 'XXX ' |
| 35 | 9(5) | SSIDSDEB | Data Exchange Buffer Size | '02048' |
| 40 | X(1) | SSIDSR | Send/Receive Capabilities | 'B' |
| 41 | X(1) | SSIDCMPR | Buffer Compression Indicator | 'N' | [4e]
| 42 | X(1) | SSIDREST | Restart Indicator | 'N' | [4e]
| 43 | X(1) | SSIDSPEC | Special Logic Indicator | 'N' | [4e]
| 44 | 9(3) | SSIDCRED | Credit | '099' | [30 39 39]
| 47 | X(1) | SSIDAUTH | Secure Authentication | 'N' | [4e]
| 48 | X(4) | SSIDRSV1 | Reserved | ' ' | [20 20 20 20]
| 52 | X(8) | SSIDUSER | User Data | ' ' | [20 20 20 20 20 20 20 20]
| 60 | X(1) | SSIDCR | Carriage Return | '
' | [0d]
o-------------------------------------------------------------------------------
[ :48 AM] [Session 15033055135604] Received command ESID
[ :48 AM] [Session 15033055135604] Received command
o----------------------------------------------
| ESID End Session
o----------------------------------------------
| 0 | X(1) | ESIDCMD | ESID Command | 'F' | [46]
| 1 | 9(2) | ESIDREAS | Reason Code | '05' | [30 35]
| 3 | 9(3) | ESIDREASL | Reason Text Length | '000' | [30 30 30]
| 6 | T(n) | ESIDREAST | Reason Text | '' | []
| 6 | X(1) | ESIDCR | Carriage Return | '
' | [0d]
o----------------------------------------------
[ :48 AM] [Session 15033055135604] Statemachine "Session Connection State Machine" received signal "ESID", state is "I_WF_SSID"
[ :48 AM] [Session 15033055135604] Statemachine "Error and Abort State Machine" received signal "F_ABORT_IND", state is "I_WF_SSID"
[ :48 AM] [Session 15033055135604] Session terminated [OFTP2 - XXX] ("Local side emergency close down", internal code 5)
[ :48 AM] [Session 15033055135604] Connection closed [OFTP2 - XXX, .com/xxx.xxx.xxx.xxx:3305]. Established for 0.7s, 96 bytes transfered

Thank you for assistance.

Kind regards
M.

Forum
OFTP2

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Also when partner is trying to send me a file they receive an error:
Session aborted by remote entity...

I have tried all different settings, but I do not understand why this error is happening.