After investigating this particular issue thoroughly, it turns out that there are several different scenarios that might be causing this error code. Here’s a shortlist of potential culprits:
Method 1: Renaming the Missing Machines
As it turns out, this problem is most likely occurring due to a NETBIOS resolution change that was implemented with a Windows 10 update that ended up making machines part of a workgroup CASE-SENSITIVE. So if you have a workgroup ported over from an older Windows build (resulted from an upgrade), you might find yourself in a situation where machines that have names containing both lower and upper case letters will no longer be visible. This can be achieved by accessing the machine containing lower and upper cases and changing the name of the PC to the upper-case only. However, depending on your Windows version, the steps of doing so will be different. We’ve created 2 separate guides to accommodate every Windows user. Feel free to follow the sub-guide associated with the Windows version that you’re using.
A. Changing the Machine Name on Windows 10
B. Changing the Machine Name on Windows 7 and Windows 8.1
Once you change the name of the machine to uppercase only, ping or retrace it once again and see if you’re still encountering the same Transmit error: code 1231. If this problem is still occurring, move down to the next potential fix below.
Method 2: Reinstalling the Network Adapter
According to some affected users that managed to fix this problem, this issue can also occur due to a glitch with the network adapter that makes the machine invisible for the local workgroup. If this scenario is applicable, you should be able to fix this problem by reinstalling the network adapter and ensuring that you install the latest driver version available. In case you’re not sure how to do this, follow the instructions below to reinstall the Network adapter using the Device Manager utility: In case the same Transmit error: code 1231 issue is still occurring, move down to the next potential fix below.
Method 3: Enabling Network Discovery and Automatic Setup
As it turns out, the Transmit error: code 1231 can also occur in instances where computers part of the homegroup are not configured to be discovered over the network or Automatic Setup is not enabled. If this scenario is applicable, you should be able to fix this problem by accessing the Advanced sharing settings on every involved computer and adjusting the default Network discovery behavior. Here’s a quick guide on how to make this modification on Windows 7, Windows 8.1, and Windows 10: Note: The steps below are universal and should work regardless of which Windows version that you’re using. Keep in mind that you need to repeat the steps below with every computer that’s part of the workgroup. If the same problem is still occurring, move down to the next potential fix below.
Method 4: Doing a Complete TCP / IP reset
As it turns out, this problem is often time associated with a TCP / IP configuration problem. In most cases, this ends up being associated with a glitch having to do with the network adapter or it’s a classic case of a bad DNS range. If this scenario is applicable, you should be able to fix this problem by doing a complete TCP / IP reset on every computer that’s part of the local workgroup. This operation has been confirmed to be successful by a lot of affected users that were previously encountering the Transmit error: code 1231. Here’s a quick step by step guide on performing a complete TCP / IP reset: Note: The instructions below are universal and will work regardless of which Windows version you’re currently using. If the same problem is still ongoing, move down to the next potential fix below.
Method 5: Creating a .bat script
If you want to avoid having to rename every computer that’s part of the workgroup to upper-case only, there’s one solution that will remove this requirement from Windows 10. But in order to enforce it, you’ll need to create a .bat script that’s capable of modifying the way workgroups work on Windows 10. If you are prepared to go this route, start following the instructions below to create a bat script that’s capable of resolving the Transmit error: code 1231:
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