# Communication Error #0 when logging in to 750-832 BACnet Controller

**URL:** <https://www.wago.community/t/communication-error-0-when-logging-in-to-750-832-bacnet-controller/2494>\
**Category:** CODESYS\
**Tags:** codesys\
**Created:** [January 9, 2026, 11:06am UTC](https://www.wago.community/t/communication-error-0-when-logging-in-to-750-832-bacnet-controller/2494 "2026-01-09T11:06:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![RudyA23](https://avatars.discourse-cdn.com/v4/letter/r/a88e4f/32.png) [@RudyA23](https://www.wago.community/u/RudyA23)\
**Post date:** [January 9, 2026, 11:06am UTC](https://www.wago.community/t/communication-error-0-when-logging-in-to-750-832-bacnet-controller/2494/1 "2026-01-09T11:06:36Z")

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I am having communication issues when trying to log in on a 750-832 4th Gen Controller.

- I checked the WBM, set the IP Address and checked the port for CODESYS 2455 is enabled.
- I can ping the device from my PC.
- I am using Codesys v2.3 to log in but it fails giving the communication error #0 error.

What are the possible remedies for this error ?

How do i configure the correct gateway settings and connection parameters ? UDP or TCP ? Because i get different suggestions when searching online.

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**Author:** ![WagoDamRud](https://sea2.discourse-cdn.com/flex016/user_avatar/www.wago.community/wagodamrud/32/258_2.png) [@WagoDamRud](https://www.wago.community/u/WagoDamRud)\
**Post date:** [January 9, 2026, 2:22pm UTC](https://www.wago.community/t/communication-error-0-when-logging-in-to-750-832-bacnet-controller/2494/2 "2026-01-09T14:22:43Z")

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Hello @RudyA23 !  
Which channel do you use? It should be Tcp/Ip

 ![image](https://us1.discourse-cdn.com/flex016/uploads/wago/original/2X/a/a3fe1776a25f7d758403e00a4e9a015e5d080301.png)