I'm attempting to transfer data with Rebex Win Forms client but get the error: 500 I won't open a connection to 10.0.38.104 (only to 81.106.223.248)
  12:38:21.334 Info Command: PROT P
  
  12:38:21.342 Verbose TLS: Received TLS packet:
  
  0000 |17-03-03-00-2C-32-30-30 20-44-61-74-61-20-70-72| ....,200 Data
  pr
  
  0010 |6F-74-65-63-74-69-6F-6E 20-6C-65-76-65-6C-20-73| otection level
  s
  
  0020 |65-74-20-74-6F-20-22-70 72-69-76-61-74-65-22-0D| et to
  "private".
  
  0030 |0A                                             | .
  
  12:38:21.342 Verbose Info: Received data over control connection:
  
  0000 |32-30-30-20-44-61-74-61 20-70-72-6F-74-65-63-74| 200 Data
  protect
  
  0010 |69-6F-6E-20-6C-65-76-65 6C-20-73-65-74-20-74-6F| ion level set
  to
  
  0020 |20-22-70-72-69-76-61-74 65-22-0D-0A            |  "private"..
  
  12:38:21.342 Info Response: 200 Data protection level set to "private"
  
  12:38:21.343 Verbose TLS: Sent TLS packet:
  
  0000 |17-03-03-00-08-54-59-50 45-20-41-0D-0A         | .....TYPE A..
  
  12:38:21.343 Verbose Info: Sent data over control connection:
  
  0000 |54-59-50-45-20-41-0D-0A                        | TYPE A..
  
  12:38:21.343 Info Command: TYPE A
  
  12:38:21.350 Verbose TLS: Received TLS packet:
  
  0000 |17-03-03-00-17-32-30-30 20-54-59-50-45-20-69-73| .....200 TYPE
  is
  
  0010 |20-6E-6F-77-20-41-53-43 49-49-0D-0A            |  now ASCII..
  
  12:38:21.351 Verbose Info: Received data over control connection:
  
  0000 |32-30-30-20-54-59-50-45 20-69-73-20-6E-6F-77-20| 200 TYPE is
  now
  
  0010 |41-53-43-49-49-0D-0A                           | ASCII..
  
  12:38:21.351 Info Response: 200 TYPE is now ASCII
  
  12:38:21.363 Debug Info: Listening for data connection at
  10.0.38.104:60999.
  
  12:38:21.365 Verbose TLS: Sent TLS packet:
  
  0000 |17-03-03-00-19-50-4F-52 54-20-31-30-2C-30-2C-33| .....PORT
  10,0,3
  
  0010 |38-2C-31-30-34-2C-32-33 38-2C-37-31-0D-0A      | 8,104,238,71..
  
  12:38:21.365 Verbose Info: Sent data over control connection:
  
  0000 |50-4F-52-54-20-31-30-2C 30-2C-33-38-2C-31-30-34| PORT
  10,0,38,104
  
  0010 |2C-32-33-38-2C-37-31-0D 0A                     | ,238,71..
  
  12:38:21.365 Info Command: PORT 10,0,38,104,238,71
  
  12:38:21.373 Verbose TLS:     :
  
  0000 |17-03-03-00-47-35-30-30 20-49-20-77-6F-6E-27-74| ....G500 I
  won't
  
  0010 |20-6F-70-65-6E-20-61-20 63-6F-6E-6E-65-63-74-69|  open a
  connecti
  
  0020 |6F-6E-20-74-6F-20-31-30 2E-30-2E-33-38-2E-31-30| on to
  10.0.38.10
  
  0030 |34-20-28-6F-6E-6C-79-20 74-6F-20-38-31-2E-31-30| 4 (only to
  81.10
  
  0040 |36-2E-32-32-33-2E-32-34 38-29-0D-0A            | 6.223.248)..
  
  12:38:21.373 Verbose Info: Received data over control connection:
  
  0000 |35-30-30-20-49-20-77-6F 6E-27-74-20-6F-70-65-6E| 500 I won't
  open
  
  0010 |20-61-20-63-6F-6E-6E-65 63-74-69-6F-6E-20-74-6F|  a connection
  to
  
  0020 |20-31-30-2E-30-2E-33-38 2E-31-30-34-20-28-6F-6E|  10.0.38.104
  (on
  
  0030 |6C-79-20-74-6F-20-38-31 2E-31-30-36-2E-32-32-33| ly to
  81.106.223
  
  0040 |2E-32-34-38-29-0D-0A                           | .248)..
  
  12:38:21.373 Info Response: 500 I won't open a connection to
  10.0.38.104 (only to 81.106.223.248)
  
  12:38:21.381 Debug Info: Error while starting data transfer:
  Rebex.Net.FtpException: I won't open a connection to 10.0.38.104 (only
  to 81.106.223.248) (500).
  
  at Rebex.Net.Ftp.aujt(Int32 cw, Boolean cx)
  
  at Rebex.Net.Ftp.aujy(EndPoint dc)
  
  at Rebex.Net.Ftp.aukg(String dm, Boolean dn, ychh dp, snfi dq,
  Int64 dr, FtpTransferState ds)
  
  12:38:21.382 Debug Info: Error while initializing data connection.
  
  12:38:21.383 Error Info: Rebex.Net.FtpException: I won't open a
  connection to 10.0.38.104 (only to 81.106.223.248) (500).
  
  at Rebex.Net.Ftp.aujt(Int32 cw, Boolean cx)
  
  at Rebex.Net.Ftp.aujy(EndPoint dc)
  
  at Rebex.Net.Ftp.aukg(String dm, Boolean dn, ychh dp, snfi dq,
  Int64 dr, FtpTransferState ds)
  
  at Rebex.Net.Ftp.aumh(String hi, Boolean hj, Stream hk, Int64 hl,
  String hm, snfi hn)
  
  12:38:21.383 Error Info: Rebex.Net.FtpException: I won't open a
  connection to 10.0.38.104 (only to 81.106.223.248) (500).
  
  at Rebex.Net.Ftp.aujt(Int32 cw, Boolean cx)
  
  at Rebex.Net.Ftp.aujy(EndPoint dc)
  
  at Rebex.Net.Ftp.aukg(String dm, Boolean dn, ychh dp, snfi dq,
  Int64 dr, FtpTransferState ds)
  
  at Rebex.Net.Ftp.aumh(String hi, Boolean hj, Stream hk, Int64 hl,
  String hm, snfi hn)