cannot access default share \\IP\c$ error 0x80070043

Question

hi. this was working just fine until yesterday that i realized i wasn't able to access any share resource over the network, not for my hyper-v VMs or via VPN to some customer site.

basically i don't get the prompt for credentials. and if i telnet IP 445, i can access the service.

my OS is 10.0.19042

SMB1 is enabled

i'm pretty sure this behavior started after some updates applied recently.

Firewall profiles are OFF for my local and remote machines

any tip?

thanks.

Answer 1

OK, so issue was solved after doing this:

1- remove WSL feature
2- Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanWorkstation
DependOnService it was bad.. (didn't took a screenshot, so I can't remember exactly the previous config, I THINK IT WAS P9NP and nothing else)
I've delete the MultiSZ value, restarted machine.
LanmanWorkstation Service wasn't starting.
I took the example of one of my VMs and set the DependOnService like this:

restarted localmachine
voilá
i get the prompt, enter creds

and i'm in

I will try later enabling WSL again.. if i encounter the same issue, I will use a Debian VM instead of WSL.

Answer 2

@Anonymous well, def some KB messed up with this on my localmachine. with a W10 1709 VM same network, on workgroup i go straight to the default share

Answer 3

Hi,

Please refer to the following steps:

1.First check SMBclient log to see if there are something related for us to do troubleshooting.

2.Could you access default share via \hostname or \FQDN? Make sure the services have been enabled as below:

3.Temperaily disable any third-party AV software to do a check.

i'm pretty sure this behavior started after some updates applied recently.

4.If the above steps still don't work, in order to narrow down whether the issue is related with updates, we can uninstall recently installed KB one by one to do a test.

To remove the LCU after installing the combined SSU and LCU package, use the DISM/Remove-Package command line option with the LCU package name as the argument.

Best Regards,
Candy

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Answer 4

Please see my reply to this similar thread.

https://learn.microsoft.com/en-us/answers/questions/377263/windows-cannot-access-pcname.html

Run the troubleshooters on both the client and the server.

Answer 5

@MotoX80
after running the troubleshooter i get the message
"You don't have permission to access the share"
Now I know that, because I'm on a domain and the remote computer is on a different domain.
There's no trust between my domain and the remote domain, and that is correct. It has to be like that.
Some weeks ago I was able to access after the credentials prompt.
Now I don't get the credentials prompt.
This also happens for my Hyper-V VMs, for example if I have a VM on a WORKGROUP. I cannot access the default share or any share with EVERYONE / FULL CONTROL

@Anonymous
1-SMBClient doesn't show any info related to this request.
2-I cannot access via hostname or FQDN, this is a different domain and DNS servers. That's why I use IP. The services are enabled on the remote machine
3-FW off on all profiles. I don't have any other AV than WindowsDefender
4-I will try rolling back some KBs.

ping to that VM

telnet to 445
https://i.imgur.com/NM0DPPM.gif

Meanwhile, isn't there any information about why I don't get the prompt for credentials anymore?

thanks,