We have encountered a problem what appears to be network issues where share connections from our windows 10 & 11 clients which reside on a particular subnet (24). Some history about the problem - I am unable to map a drive e.g. \Testmachine\c$ to any devices in the following subnet .24 I am able to connect to subnets outside - the difference between these two sets of networks are the broken set .24 use a different firewall, when we attempt to map the drive we get this error message: Y ou cant connect to the file share because it's not secure. This share requires the obsolete SMB1 protocol, which is unsafe and could expose your system to attack. Your system requires SMB2 or higher. For more info on resolving this issue, see: http://gp.microsoft.com/fwlink/?linkid=852747 this also prevents WMI connectivity to these devices to some extent and prevents MCM client push as access to the admin$ share cannot be made. This particular problem is affecting quite a significant number of client machines (100 plus). Troubleshooting I have attempted. Ping from .24 to all subnets is successful. Test-netconnection -computer from a powershell command is successful for all the devices on all subnets. I have moved a .24 device out of an OU which has specific GPO firewall rules associated with it to an OU where there are no GPO's policies Linked. We still get the same issue. The account used for attempting to connect to test connect to a share via UNC had admin rights. Has anyone had any similar issues - we have asked the network engineers to take a look at the firewalls and they have stated that there are no filters or blockages on the firewalls. Can someone help with this situation as we are hitting a dead-wall. Any advice or help would be greatly appreciated. Deleted This comment has been deleted due to a violation of our Code of Conduct. The comment was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information. This comment has been deleted due to a violation of our Code of Conduct. The comment was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information. Jing Zhou • 7,805 Reputation points • Microsoft External Staff 2024-04-10T05:30:02.3333333+00:00 Hello, Thank you for posting in Q&A forum. This error could be caused by the SMB version mismatch. The SMB server require SMB v1 but your client is enabled with SMB v2. Now SMB v1 is not recommended any more as there could be some security issue, hence you need to check with your security team and take further action: If you take final decision to user SMB v1, you need to enable SMB v1 on client by command: Check: Get-SmbServerConfiguration | Select EnableSMB1Protocol Enable: Set-SmbServerConfiguration -EnableSMB1Protocol $true If you take final decision to user SMB v2, you need to enable SMB v2 on server by command: Check: Get-SmbServerConfiguration | Select EnableSMB2Protocol Enable: Set-SmbServerConfiguration -EnableSMB2Protocol $true To help other customers who may be facing the same issue, please don't forget to vote if the reply is helpful. Best regards， Jill Zhou 0 comments No comments Sign in to comment Add comment Thank you for posting in Q&A forum. This error could be caused by the SMB version mismatch. The SMB server require SMB v1 but your client is enabled with SMB v2. Now SMB v1 is not recommended any more as there could be some security issue, hence you need to check with your security team and take further action: If you take final decision to user SMB v1, you need to enable SMB v1 on client by command:

Get-SmbServerConfiguration | Select EnableSMB1Protocol Set-SmbServerConfiguration -EnableSMB1Protocol $true If you take final decision to user SMB v2, you need to enable SMB v2 on server by command: Get-SmbServerConfiguration | Select EnableSMB2Protocol Set-SmbServerConfiguration -EnableSMB2Protocol $true To help other customers who may be facing the same issue, please don't forget to vote if the reply is helpful. Deleted This answer has been deleted due to a violation of our Code of Conduct. The answer was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information. Comments have been turned off. Learn more This answer has been deleted due to a violation of our Code of Conduct. The answer was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information. Comments have been turned off. Learn more Marcin Policht • 106.8K Reputation points • MVP • Volunteer Moderator 2024-04-08T11:19:42.8+00:00 Enforce SMB 3.x on the client computers on that subnet and on the target server. Details at https://learn.microsoft.com/en-us/windows-server/storage/file-server/troubleshoot/detect-enable-and-disable-smbv1-v2-v3?tabs=server If the above response helps answer your question, remember to "Accept Answer" so that others in the community facing similar issues can easily find the solution. Your contribution is highly appreciated. hth Marcin 1 comment Show comments for this answer Mike B. Martisko • 40 Reputation points 2025-11-04T18:50:08.0066667+00:00 It never fails, every damn time they create updates they make it more difficult to do everything. It is a big money scam, the move stuff around, they hide it, and they make it harder to do what you need to do. Register shows computer I want to connect to, but the User name and password which I have used for 25 years, doesn't work, and this device tells me the item I want to connect to is no longer available even though it appears in the network register. How the hell can this computer find a device, put it in the register, and then when I try to connect to it, it says it is no longer available.. The best operating system by far is Vista, I have had the same computer running Vista for 25 years, never been hacked never had to do anything different to make it work, never been hacked, yet Microsoft keeps telling me I need to update, which means I need to throw away a computer that works 24/7 and buy a new one that never works,, resets itself, or just does not function as it should. 2 votes Sign in to comment Add comment Enforce SMB 3.x on the client computers on that subnet and on the target server. Details at https://learn.microsoft.com/en-us/windows-server/storage/file-server/troubleshoot/detect-enable-and-disable-smbv1-v2-v3?tabs=server If the above response helps answer your question, remember to "Accept Answer" so that others in the community facing similar issues can easily find the solution. Your contribution is highly appreciated. Mike B. Martisko • 40 Reputation points 2025-11-04T18:50:08.0066667+00:00 It never fails, every damn time they create updates they make it more difficult to do everything. It is a big money scam, the move stuff around, they hide it, and they make it harder to do what you need to do. Register shows computer I want to connect to, but the User name and password which I have used for 25 years, doesn't work, and this device tells me the item I want to connect to is no longer available even though it appears in the network register. How the hell can this computer find a device, put it in the register, and then when I try to connect to it, it says it is no longer available.. The best operating system by far is Vista, I have had the same computer running Vista for 25 years, never been hacked never had to do anything different to make it work, never been hacked, yet Microsoft keeps telling me I need to update, which means I need to throw away a computer that works 24/7 and buy a new one that never works,, resets itself, or just does not function as it should. 2 votes It never fails, every damn time they create updates they make it more difficult to do everything. It is a big money scam, the move stuff around, they hide it, and they make it harder to do what you need to do. Register shows computer I want to connect to, but the User name and password which I have used for 25 years, doesn't work, and this device tells me the item I want to connect to is no longer available even though it appears in the network register. How the hell can this computer find a device, put it in the register, and then when I try to connect to it, it says it is no longer available.. The best operating system by far is Vista, I have had the same computer running Vista for 25 years, never been hacked never had to do anything different to make it work, never been hacked, yet Microsoft keeps telling me I need to update, which means I need to throw away a computer that works 24/7 and buy a new one that never works,, resets itself, or just does not function as it should. Chandan Kumar Jha • 0 Reputation points 2025-09-18T08:22:06.1266667+00:00 network catch error code 0 comments No comments Sign in to comment Add comment network catch error code