# OMRON FINS TCP Issue **URL:** \ **Category:** General Discussion\ **Created:** [August 23, 2022, 1:20pm UTC](https://forum.inductiveautomation.com/t/omron-fins-tcp-issue/63325 "2022-08-23T13:20:57Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![d.vasilev](https://avatars.discourse-cdn.com/v4/letter/d/df705f/32.png) [@d.vasilev](https://forum.inductiveautomation.com/u/d.vasilev)\ **Post date:** [August 23, 2022, 1:20pm UTC](https://forum.inductiveautomation.com/t/omron-fins-tcp-issue/63325/1 "2022-08-23T13:20:57Z")
Guys, I can connect from laptop to Omron PLC CJ1M using TCP Fins Driver. I cannot connect however when I use the company network. Wireshark shows SACK\_PERM = 1. The parameters of the local network are: ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/e/d/ed646be76d2d1dfff04d04d0e2146d1f27ce711e.png) Any idea which parameter must be changed, since obviously it is not Omron TCP driver issue. Thank you! ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [August 23, 2022, 1:26pm UTC](https://forum.inductiveautomation.com/t/omron-fins-tcp-issue/63325/2 "2022-08-23T13:26:09Z")
At the risk of being [wrong](https://forum.inductiveautomation.com/t/mitsubishi-fx5-opc-problem/57309/9) and [surprised](https://forum.inductiveautomation.com/t/mitsubishi-fx5-opc-problem/57309/20) again… I doubt this has anything to do with TCP selective ack being enabled or not. You probably just don’t have a route to the PLC on your company network or something. ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [August 23, 2022, 1:31pm UTC](https://forum.inductiveautomation.com/t/omron-fins-tcp-issue/63325/3 "2022-08-23T13:31:32Z")
That said, feel free to f around in your registry: [Description of Windows TCP features - Windows Server | Microsoft Docs](https://docs.microsoft.com/en-us/troubleshoot/windows-server/networking/description-tcp-features#selective-acknowledgments-sacks) ---
**Author:** ![d.vasilev](https://avatars.discourse-cdn.com/v4/letter/d/df705f/32.png) [@d.vasilev](https://forum.inductiveautomation.com/u/d.vasilev)\ **Post date:** [August 23, 2022, 3:13pm UTC](https://forum.inductiveautomation.com/t/omron-fins-tcp-issue/63325/4 "2022-08-23T15:13:52Z")
Hi, Kevin, thank you for your prompt reply. I doubt too the issue has to do anything with SACK. In any case, I would not like to play around with the resisters on the server where Ignition and Kepware are installed, this is just in case I cannot figure out other solution. I was thinking what would help me is command netsh run on a computer where Omron TCP driver is in use, or Powershell TCP parameters list. That would be of real help… ---
**Author:** ![d.vasilev](https://avatars.discourse-cdn.com/v4/letter/d/df705f/32.png) [@d.vasilev](https://forum.inductiveautomation.com/u/d.vasilev)\ **Post date:** [September 5, 2022, 10:53am UTC](https://forum.inductiveautomation.com/t/omron-fins-tcp-issue/63325/5 "2022-09-05T10:53:19Z")
It took me more time but the issue is solved. Not network problem. Gateway IP address need to be added in ETN21 card settings: ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/d/5/d5237fce1bfc03b3f5f512650ff699e392b8d096.png) ---
**Author:** ![jake.r](https://avatars.discourse-cdn.com/v4/letter/j/59ef9b/32.png) [@jake.r](https://forum.inductiveautomation.com/u/jake.r)\ **Post date:** [October 19, 2026, 4:09pm UTC](https://forum.inductiveautomation.com/t/omron-fins-tcp-issue/63325/6 "2026-10-19T16:09:01Z")
Hi @d.vasilev, I am having issues establishing communication to a CJ1W-ETN21 expansion module. I have configured mine with matching settings as I see from your screenshot, and I moved the nodes on my module to match the last octet of my IP address. On the ignition side, I am using the Omron FINS/TCP driver, I set the name and host name and left the other setting as they were defaulted. Is there something else that you think I might be missing? Thanks!