Network issue

[Theresa Hadden-Martinez]

I have been a member of this group for a very long time but this is the first time I have asked for help.

 

I have a client with a single subnet with about 30 endpoints, on premise VoIP, Hyper-V host and standalone server. Three NASes (working on consolidating). Have one computer that will not see the new NAS from one location, sees the other two without a problem. The same computer with the same user profile sees it fine when located anywhere else in the office.

 

Things I have done without resolution.

1. Have tried 2 computers at this location, one Win 10 and one Win 11, with the same issue.
2. Used both user and administrative profiles
3. Changed cables, network plug, switch ports
4. Enabled SMB 1.0
5. Updated network sharing
6. Updated BIOS and all drivers on the computer
7. Run DISM and sfc to fix component and other files.
8. Ran net use and it reports no mapped drives although I have two. Created new mapped drive and it shows up but not the two existing ones.

 

I an at my wits end as to what can be causing it. The only thing I can think of is to wipe it and reinstall but do not think that will work.

 

Theresa Hadden-Martinez
Expertiva Computing, Inc.
had...@expertiva.com
505-620-8940

 

Cats teach us that boundaries are important, naps are essential, and love is unconditional

 

[Philip Elder]

IPConfig /ALL at the NAS or snip the complete eth0 or BOND setup.

 

IPConfig /ALL at the endpoint causing the problem.

 

IPConfig /ALL from the PDCe.

 

Sanitize as needed.

 

Philip Elder MCTS

Senior Technical Architect

Microsoft High Availability MVP

MPECS Inc.

E-mail: Phili...@MPECSInc.Ca

Phone: +1 (780) 458-2028

Web: www.MPECSInc.Com

Blog: Blog.MPECSInc.Com  

Twitter: Twitter.com/MPECSInc

 

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[Erik Goldoff]

are trying by name/FQDN only, or by IP address too?  If IP works fine, it's DNS

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[Jonathan Raper]

Hello longtime listener first time caller!

I would compare IP address, subnet, and gateway from working location vs failing location.

Also, what are the switchport configurations for all devices involved? Native vlan, voice vlan, etc.

Jonboy

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From: ntsys...@googlegroups.com <ntsys...@googlegroups.com> on behalf of Erik Goldoff <egol...@gmail.com>
Sent: Thursday, March 26, 2026 1:10:58 PM
To: ntsys...@googlegroups.com <ntsys...@googlegroups.com>
Subject: Re: [ntsysadmin] Network issue

 

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[Wright, John M]

Just to be clear, when you say that the computer won’t see the new NAS, it won’t ping by hostname and/or IP, won’t map, something else, or all of these?

 

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From: ntsys...@googlegroups.com <ntsys...@googlegroups.com> On Behalf Of Theresa Hadden-Martinez
Sent: Thursday, March 26, 2026 12:36 PM
To: ntsyy...@googlegroups.com
Subject: [ntsysadmin] Network issue

 

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[brett...@hotmail.com]

As everyone else points out, understanding what the failure lies (dns, IP, SMB) will dictate what a "fix" would look like. 

However, you point out that they have a single subnet, which would imply that the "different locations" are simply different outlets on the same network, that are all within the same IP address space. It would imply that the PC simply uses it's same IP stack (probably even its same DHCP allocated address, as it's just "relocating" within a different space) and that there's no routing involved as it's all a single subnet.  I'd also however question if there's VLANs in play here, as that could change things.... 

An important test therefore is going to be, use another working PC connected to the "not working" location and prove that the problem is also nothing to do with the PC, but is therefore somehow linked to this cable. I'd ask your site cabler is this specific cable in any way "special", like did they have a unique problem they needed to solve when they installed it, or is there another physical cable they can use at the same location or that was run at the same time, that can be tested to see if it also has the issue? Perhaps it's some weird ethernet cable length issue that only manifests on one particular IP?  But here's my hunch, is there a secondary switch involved that has VLAN limitations or configuration so that the IP address space and VLAN for the working NAS are permitted, but the IP address/VLAN for the non-working one is not?

[Theresa Hadden-Martinez]

Right now we've decided it has to be something in the wiring. Changing over to Wi-Fi instead of ethernet and you can access the NAS. Will keep you updated and trying to get tech on site now.

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[Jim Behning]

Have you rebooted network switches? A proper network guru might flush caches in switches. I am not a guru. 

I do have an inexpensive Fluke cable tester. It cost less than $2,000 US when i bought it a decade ago. It is handy to properly test cabling.

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[Theresa Hadden-Martinez]

Done. One of my favorite things to do when stumped

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[Denes, Laszlo]

Sounds like networking but just to throw it in the mix … any GPO applied that are different depending on user, computer, subnet, etc.

And are both machine ethernet or Wi-Fi on same subnet etc

 

Thank you in advance for your time.

 

Laszlo

 

Laszlo Denes

Technical Analyst Servers

Information Systems

t: ext. 214

lde...@torontograce.org

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[Sharon Tirosh]

We all know that it can't be DNS! because it's always DNS.....

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[Jim Behning]

I had a workstation that was connecting at 10mb to a gig switch. I thought I checked the wall cables with my Fluke CableIQ. New Reatlec NIC driver seemed to fix the issue. A month later it is acting up again. I checked using the CableIQ tester. It showed 2 wires with breaks at the patch panel and of course failed the speed test. Overhead lights out by the patch panel so no look see until the light gets fixed. I moved it from port C2 to port C1 that tested good.

Sometimes you waste time not properly using a cable testing tool. 

That C2 might have gotten loose when I was running and punching down another half dozen network cables. Previous cable tech might have not had enough slack or maybe missed a perfect punch on 2 wires. We shall see when the light fixture is repaired so I can see what I am doing.

I also burned some time trying to get into one of the switches. Serial port access and a running config that did not seem to be working properly.

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[John Goodman]

SMB 1 or 2 protocol enabled?

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On Thu, Mar 26, 2026 at 12:36 PM Theresa Hadden-Martinez <had...@expertiva.com> wrote:

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[Theresa Hadden-Martinez]

Using 1.2 but tried version 1.

 

Got this fixed by using another drop. There were 3 drops there, 2 caused the problems but the third one worked. What I found so strange was the ability to go to some resources but not others. The two bad drops did not test out as bad. Still do not fully understand why but it is working.

 

Thanks for all the suggestions. If anyone else has seen something similar I would be interested in hearing about it.

 

Theresa Hadden-Martinez
Expertiva Computing, Inc.
had...@expertiva.com
505-620-8940

 

Cats teach us that boundaries are important, naps are essential, and love is unconditional

 

From: ntsys...@googlegroups.com <ntsys...@googlegroups.com> On Behalf Of John Goodman
Sent: Thursday, April 2, 2026 12:09 PM
To: ntsys...@googlegroups.com
Subject: Re: [ntsysadmin] Network issue

 

SMB 1 or 2 protocol enabled?

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[Theresa Hadden-Martinez]

Theresa Hadden-Martinez reacted to your message:

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From: ntsys...@googlegroups.com <ntsys...@googlegroups.com> on behalf of Jim Behning <jimbe...@gmail.com>
Sent: Thursday, April 2, 2026 6:06:55 PM
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Subject: Re: [ntsysadmin] Re: Network issue

 

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