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Hello,

I tried tu use FilleZilla 3.55.1 win 64 on a windows 10 host using FTPS and I got an ENETUNREACH message .
I tried an old version of FileZilla 3.3.2.1 and file tranfert with FTPS works fine .

I also tried an another old version of FileZilla 3.37.4 and got also an ENETUNREACH message .

The host has no default gateway but a particular route to the FTP server that we added .

Is this a bug ?

I do not use Kaspersky ...

Please post a complete log of a connection attempt.

Hello,

FTPS works fine now but I had to change the route to my FTPS server .
The route was initially a route that I typed this way on my windows 10 client
route -p add @FTPS_SERVER mask 255.255.255.255 @GATEWAY

I changed this to
route -p add @FTPS_SERVER_NETWORK mask 255.255.255.0 @GATEWAY

I noticed that I got the same error with WinSCP .
So maybe it's a problem with a network library ?

Here's the log
2021-09-16 09:22:00 3492 1 Status: Selected port usually in use by a different protocol.
2021-09-16 09:22:00 3492 1 Trace: CControlSocket::SendNextCommand()
2021-09-16 09:22:00 3492 1 Trace: CFtpLogonOpData::Send() in state 0
2021-09-16 09:22:00 3492 1 Status: Connecting to 172.16.20.250:990...
2021-09-16 09:22:00 3492 1 Status: Connection attempt failed with "ENETUNREACH - Network unreachable".
2021-09-16 09:22:00 3492 1 Trace: CRealControlSocket::OnSocketError(118)
2021-09-16 09:22:00 3492 1 Trace: CFtpControlSocket::ResetOperation(66)
2021-09-16 09:22:00 3492 1 Trace: CControlSocket::ResetOperation(66)
2021-09-16 09:22:00 3492 1 Trace: CFtpLogonOpData::Reset(66) in state 1
2021-09-16 09:22:00 3492 1 Error: Could not connect to server
2021-09-16 09:22:00 3492 1 Status: Waiting to retry...
2021-09-16 09:22:05 3492 1 Trace: CFtpControlSocket::ResetOperation(66)
2021-09-16 09:22:05 3492 1 Trace: CControlSocket::ResetOperation(66)
2021-09-16 09:22:05 3492 1 Trace: CControlSocket::ResetOperation(66)
2021-09-16 09:22:05 3492 1 Trace: CControlSocket::SendNextCommand()
2021-09-16 09:22:05 3492 1 Trace: CFtpLogonOpData::Send() in state 0
2021-09-16 09:22:05 3492 1 Status: Connecting to 172.16.20.250:990...
2021-09-16 09:22:05 3492 1 Status: Connection attempt failed with "ENETUNREACH - Network unreachable".
2021-09-16 09:22:05 3492 1 Trace: CRealControlSocket::OnSocketError(118)
2021-09-16 09:22:05 3492 1 Trace: CFtpControlSocket::ResetOperation(66)
2021-09-16 09:22:05 3492 1 Trace: CControlSocket::ResetOperation(66)
2021-09-16 09:22:05 3492 1 Trace: CFtpLogonOpData::Reset(66) in state 1
2021-09-16 09:22:05 3492 1 Error: Could not connect to server

Looks like the routing isn't correct. Sadly the system doesn't tell you which network component sent the error.