The ObjectScript commands you are using to open a TCP connection and write to it appear correct based on InterSystems IRIS documentation.

1. Opening a TCP connection: To initiate a TCP connection, the OPEN command syntax is correct. When using OPEN "|TCP|"_PORT:(IP::"PSE"):10, PORT should be in the allowed range, and IP provided should be an IPv4 address (e.g., "10.200.100.50"). The OPEN command reserves and initiates the device for communication, setting $TEST to 1 upon success [1].

2. Writing to the TCP connection: Using the WRITE command with USE to specify the TCP device is correct. Particularly, the control *-3 flushes the output buffer forcing a write operation to the physical device. The control ensures that data moves from the TCP device buffer to the network buffer, and then to the physical device [1][2]. In the case of TCP communication, this approach is standard for ensuring immediate data transmission without buffering [1].

3. Operating System Handling: The TCP device I/O in InterSystems IRIS leverages underlying operating system mechanisms for network communication. ObjectScript commands such as OPEN, USE, WRITE, and CLOSE interact with these mechanisms to establish connections, send or receive data, and close the connections gracefully [1].

Errors you are facing may be related to network configurations, firewalls, or incorrect VPN setups and not necessarily the syntax or execution of ObjectScript commands. The network team may need to investigate connection-specific issues on the firewall or VPN [1].

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The error message indicates that the connection to the FTP server is failing due to a missing required argument, identified with the error code 501. Here are troubleshooting steps and relevant settings that could help address your issue:

1. Verify FTP Settings: Ensure that the FTP server settings such as server address (FTPServer), port (FTPPort), username, and password are correctly configured. These settings need to be defined within the FTP adapter or session you are interacting with. Use the FTPServerSet() and FTPPortSet() methods for configuring the server and port, respectively [1][2].

2. Configure SSL/TLS Settings: If you're using SSL/TLS, ensure the configuration is correct. The SSLConfigSet() method allows specifying the TLS configuration entry for authentication. Incorrect or missing SSL configuration could cause issues like the one in your error message [1][2].

3. Check Credentials: Use the CredentialsSet() method to specify the production credentials entry authorizing the connection to the FTP server. Ensure the credentials match those of the FTP server [1][2].

4. Invoke Adapter Test: Use the TestConnection() method provided by the FTP Adapter to verify the connection state. This method can help correct connection-related properties if the adapter thinks it is connected but has lost the socket [1].

5. Error Code 501 Analysis: The error code 501 suggests a protocol error, possibly due to missing arguments during connection initialization. Examine any mandatory parameters in your FTP setup that might be omitted [1][2].

6. Debugging and Logging: Follow InterSystems guidelines for debugging FTP connections, possibly using logs or additional parameter tracing frameworks [2].

Example code snippet to configure the FTP settings:

Set sc = ##class(%Net.FtpSession).FTPServerSet("localhost")
Set sc = ##class(%Net.FtpSession).FTPPortSet("21")
Set sc = ##class(%Net.FtpSession).CredentialsSet("username_password")
Set sc = ##class(%Net.FtpSession).SSLConfigSet("SSLConfigName")
If $$$ISERR(sc) { Write "Error configuring FTP settings! ", sc }

Ensure FileZilla and the FTP adapter are configured for correct environment compatibility and log events to identify any specific errors [1][2].

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