---
title: Fix Client/Server Communication Problems
slug: help/en-us/dairycomp/comm-error
docTags: 
createdAt: 2026-01-26T11:43:17.528Z
---

<font color="#67854E">**Question**</font>: I'm getting a communication error when trying to connect my DairyComp client or Pocket CowCard to the DairyComp server. How can I fix this problem?

<font color="#67854E">**Answer**</font>: If you get a communication error when attempting to connect your DairyComp client or Pocket CowCard to the DairyComp server, try the simple steps below:

- Ensure that both the client computer/Pocket CowCard and the server computer are connected to the internet.
- Ensure that the server is installed on the main computer and that it's started.

  :::ExpandableHeading
  ### How do I check if my server is installed and running?

  Enter `SERVER` in the command line to open the Server Options window.

  The top of the window should indicate the server is **Started**. If the server is stopped, select **Start** from the window to start the server.

  ::Image[]{src="https://api.archbee.com/api/optimize/3h8pSJcGUXEi4HGCCYPTA/KVVyy5CUUMY4mCxe9AT6m_serverstarted.png" size="44" isUploading="false" initialPath="../Resources/Images/faqs/CommErrors/ServerStarted.png" githubPath="Resources/Images/faqs/CommErrors/ServerStarted.png" width="876" height="227" darkWidth="876" darkHeight="227" showCaption="false"}
  :::
- Ensure that the IP address to which the client/Pocket CowCard system is trying to connect matches the IP address that the server computer is currently using. See [Find your DairyComp IP Address](docId\:KTmm-r8dtP5LB7hePXedp) for more information about checking DairyComp IP addresses.
- Reboot both the client computer/Pocket CowCard device and the server computer and try again to establish communication between them.

If none of the steps above solve your communication issues, contact [VAS Support](docId\:erZnbNH1Ww36p9Q6RNPpV) for help.

:::ExpandableHeading{customAnchorSlug="video"}
### Click here for a video tutorial on this feature!

For information on checking your IP address to refresh your PCC Android device, check out the following video:

::embed[]{url="https://player.vimeo.com/video/534142282"}
:::