Opened 6 hours ago
Closed 5 hours ago
#13250 closed Bug report (rejected)
We can't create a Power Automate FTP Connector with our FileZilla Server
| Reported by: | Merz, Karolin | Owned by: | |
|---|---|---|---|
| Priority: | high | Component: | FileZilla Server |
| Keywords: | Power Automete FTP Connector | Cc: | Merz, Karolin |
| Component version: | Operating system type: | Windows | |
| Operating system version: |
Description
We did on our side some digging with sysinteral tools, wireshark and co.
What we can see is that the FTPs Session are opened successfully over the Power Automate Connector but when the FTPs is switching to the passive mode and starting to transfer data like the folder dir the session stops without any more traffic visible on our side.
We are using Filezilla Server (Free variant) to host the FTPs Server.
We can see that the Power Automate Connector is using TLS1.3. So, we tested also to open a FTPs Session forced to TLS 1.3 with the Filezilla Client. This session was connecting without any issues.
After some Research we guess that it has something to do with the NoSessionReuseRequired implemented in the TLS 1.3 SSL stream.
Can you confirm that Power Automate FTP Connector can’t connect a FTPs when the FTPs Server required a Session Reuse?
This would then explain why it works well with everything else and just not with the Power Automate Connector.
Unfortunately, it’s not possible to change the Session Reuse option on the Filezilla Server.
Fortunately it cannot be disabled! TLS session resumption on the data connection is an important security feature, it prevents data connection stealing attacks. Due to this, FileZilla Server requires session resumption, and this requirement cannot be disabled.
If the client you are using does not support resumption it is insecure. Contact your client vendor to have the client fixed.