SFTP SSH Connector bad gateway error in logic apps workflow

Can you help me to solve the below error.

I am getting the below error in logic apps SFTP SSH connector when i am trying to connect to the on prem SFTP server. I am getting a successful response when I use the SFTP In-app connector.

Failed to create connection: { "error": { "code": 504, "source": "f0d3d9b65e5a7164.15.common.logic-westeurope.azure-apihub.net", "clientRequestId": "ea3ea7a3-4488-49b7-b78c-39db6a850df0", "message": "BadGateway", "innerError": { "status": 504, "message": "A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond\r\nclientRequestId: ea3ea7a3-4488-49b7-b78c-39db6a850df0", "error": { "message": "A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond" }, "source": "sftpwithssh-we.azconn-we-002.p.azurewebsites.net" } } }