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Error creating FTP connection in Flow

Hi all,


A few months ago I created a FTP connection for one of my flows and everything was working perfectly. Now the flow using this connection started to present an error. When I tried to create the connection again, I started to get this error: "Unable to connect to the remote server: ''. Please verify server logs to troubleshoot connection issues". 


I've whitelisted all the possible IPs Flow might be using, considering the environment region I'm using.


One test that worked only once was to create a new environment with a different region. In this case Flow was able to connect to the FTP server at the first time. Although, when trying to reconnect, it didn't work anymore.


Does anyone have been through this issue or have any clue on how to solve it?


Thank you.

Dual Super User III
Dual Super User III

Do you have access to the FTP server and can you check the logs there? Can you create an FTP connection with the server outside of Flow?

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Yes, outside flow and using the same credentials the connection works perfectly.


Regarding the logs, I don't have access.



I tried to set the connection using wrong credentials in order to test if the problem was within my user. At the first time Flow presented a message of "invalid credentials". All the next tentatives returned the "Unable to connect to the remote server" error.


Seems like Flow is not even being able to reach my FTP server.

Is your FTP server on-premises inside a firewall?  Remember the Flow will be coming from the cloud, not your local network.

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Yes, it is inside a firewall. Although, I've whitelisted all the IPs necessary for MS Flow, according to the documentation. Even more, we got to the point of opening the firewall for every IP so we could test if the connection would be successful.


We also performed a test using an external network. In this test we were able to connect to the FTP from outside Flow, but not from inside.

Hi @LucasMartins ,


Please check the following doc on Microsoft (MS) Flow SFTP connector tips, tricks, and errors:


Hope it could be helpful for you.


Best regards,



Community Support Team _ Mabel Mao
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

Hi @v-yamao-msft ,


Thank you for your response.

I'm using the standard FTP connector, not the SFTP. I believe the only useful tip on the link you mentioned is the IP Firewall rules, which I've already whitelisted.


Anyway, thank you!


I'm attaching my connection details with the error presented.


FTP Connection.PNG


Furthermore, at some point Flow presented this error:

"Please check your account info and/or permissions and try again. Details: Error from token exchange: The connection (europe-001/ftp/20a441b618f640e08b54131387495c30) is not found. Please create new connection and change your application to use the new connection."

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