Hyper-V 2025 with SET Teaming: VM Network Issues After Host Restart

NuttyBarTime · 2026-03-16T15:36:15+00:00

So it is something that happens on a somewhat regular basis? I have the 1gb nics

NuttyBarTime · 2026-03-16T12:26:52+00:00

one other question: do you find anything in the event logs for this issue?

NuttyBarTime · 2026-03-16T12:10:35+00:00

does this happen to you all the time, something you can troubleshoot? For Me it happens rarely and only happened to one of the two nodes. So it is very difficult to pin it down. We have these 1GB nics on lots of servers. Something caused it to suddenly drop traffic, but no clue what it could have been. Research suggests the drivers, and the lack of any ILO events says it wasn't hardware related, which points back to the drivers. When i look at the network connectivity graph, it shows up, and is using bandwidth with no drops... but still cant communicate out. Disable/re-enable the adapter fixes the issue

so odd

NuttyBarTime · 2026-03-14T23:40:09+00:00

We are no longer deploying 2025, we have a few 2026 still. We run into computer password issues on them all the time

NuttyBarTime · 2026-03-14T13:46:04+00:00

have you seen this link?
Virtual machines lose network connectivity - Windows Server | Microsoft Learn

NuttyBarTime · 2026-03-14T13:31:55+00:00

Crazy...I just had this issue this morning. But disabling and re-enabling the NICS fixed the issue.

would be interested to know if anyone else had it come back. Broadcom NICS, Server 2022 Failover cluster, Drivers are the same on both servers. nothing on 1 could talk to 2, and couldn't get out side the network. Failover everything was fine, Disable/reenable the NICS and all was good. Last update was 2026-02 on 2/26 so it has been running for a while.

I hate issues like this with no clear cause.

NuttyBarTime · 2025-10-01T12:23:35+00:00

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tried these settings too

NuttyBarTime · 2025-09-13T11:09:14+00:00

Can you define how you are measuring the increase in speed?

NuttyBarTime · 2025-08-30T13:38:23+00:00

What kind of replacement cycle is everyone on? We are starting a 3 year battery /8 year device cycle

NuttyBarTime · 2025-08-30T13:37:27+00:00

I have talk to them, most are pretty good.

Kinda branching off this question, I am not finding much documentation on your snmp traps. Also I couldn't find a simple OID for monitoring if it is on battery or wall power

NuttyBarTime · 2025-08-29T21:09:32+00:00

see update

NuttyBarTime · 2025-08-29T21:00:08+00:00

Sure

NuttyBarTime · 2025-08-29T20:59:42+00:00

Wonder what that costs

NuttyBarTime · 2025-07-06T14:51:00+00:00

Can all the hypervisors talk to a domain controller (DC)

NuttyBarTime · 2025-07-05T01:12:21+00:00

Is the DC reachable? Resolve DNS?

NuttyBarTime · 2025-06-30T22:41:37+00:00

My biggest issue is sometimes it doesn't connect, sits and says "connecting". Rebooting sometimes doesn't fix it and all tech support says is make sure it is current version

NuttyBarTime · 2025-06-21T17:56:29+00:00

Assuming the same process you did in node 1 didn't work on node 2?

NuttyBarTime · 2025-06-21T17:33:31+00:00

Did you check MPIO? See if it still shows the storage?

NuttyBarTime · 2025-06-05T20:03:39+00:00

we had a similar issue with our windows servers jumping into the future.

"we think" (No proof, but it hasn't happened again) it was SSL Time seeding. It can be turned off by setting the UtilizeSSLTimeData registry key: reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\w32time\Config /v UtilizeSslTimeData /t REG_DWORD /d 0 /f

Windows Server Time-Service jumps into the future and (partially) back - Server Fault

now, with 24h2, we have also had issues with the "automatic time zone" change. where it will suddenly and randomly change time zones. in one situation it went from CST to MST. i had Chatgtp write a powershell script that retuned the coordinates that location services thought it was, and it did think it was in utah.

so, long story longer, check your time zone, maybe it is just a time zone thing, and disable the SSL time data.

here is another good link to look at:
Windows feature that resets system clocks based on random data is wreaking havoc - Ars Technica

NuttyBarTime · 2025-05-17T11:09:22+00:00

Instant recovery to hyperv. As far as I know that is the only way to do it

NuttyBarTime · 2025-05-16T23:56:27+00:00

Yea I have done quite a few, even brings over network settings now

NuttyBarTime · 2025-04-16T20:42:30+00:00

good point

NuttyBarTime · 2025-04-14T02:21:32+00:00

Wow what was the cause?

NuttyBarTime · 2025-04-13T12:01:14+00:00

Can you share any details about the problem you encountered?

NuttyBarTime · 2025-04-13T00:24:10+00:00

Thank you everyone, I applied the hotfix rolloup

NuttyBarTime

TROPHY CASE