Hello all...my first post here, so please go easy on me! I'm attempting to connect to an SBL2e module using a 1769-L33ERM Allen Bradley PLC using a Socket connection. During the OpenConnection message routine, I get an error 16#0000_0016. Looking through the Rockwell knowledge base, I have found the following information:
Problem: A Logix Open Sockets (TCP Client) is unable to connect to a 3rd party device (Slave). The Connect Message faults with Extended Error codes 16#0000_0046, 16#0000_0016, or 16#0000_0033.
Cause
The device reports WIN=0 and the 1756-EN2T module immediately closes the connection. Below is a sample of a Wireshark capture that illustrates this point.
This is done for security reasons:
Zero window is not allowed.
Enable/disable acceptance of the peer window being set to zero in the ACK of the SYN/ACK.
An attacker can use zero window to keep the node in persist time for a long time.
Solution
1756-EWEB module does not do this check. There is no workaround on the Rockwell Automation side with EN2xx modules. Customers must contact the 3rd party vendors to increase Window size.
Does anyone have any idea how to increase the Window size, as mentioned above? I'm on a bit of a time crunch, so any help as soon as possible would be greatly appreciated!
One more thing...I don't *need* to run the NetBurner as a TCP Server if there's a better (easier) way to connect to it from the PLC. Possibly by using it at a TCP Client, or using UDP, etc? Any thoughts there?
I just tried UDP, and I seem to be getting a similar error (16#0000_0046 in the "ReadSocket" message, but still covered by the previous knowledge base article that I posted). I have emailed customer support at NetBurner, and they recommended I open up a support ticket to speak with the engineering team to see if they can determine if it's possible to change the "Window size" to be something other than 0. Unfortunately, I'm not sure how to get the serial number for my device, so I can't figure out how to register on their site!
Anyone have any experience with changing the window size?
Unfortunately, I don't have the Dev Kit with me (I'm traveling internationally for business), and have never installed the Dev Tools....I only have the NetBurner SBL2e module with me.
I'm attempting to connect to an SBL2e module using a 1769-L33ERM Allen Bradley PLC using a Socket connection. During the OpenConnection message routine, I get an error 16#0000_0016. Looking through the Rockwell knowledge base, I have found the following information:
