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Netbios and UNC path network path not found

I have a backup program which relies on netbios name connection to connect to a computer to upload files for backup.

One day, it started failing to connect. I ran following commands and the results are shown.
Firewall is turned off on both. What could be the problem?
Computer A: source to backup, windows 8
Computer B: server with backup software, windows 2003

From Computer A:

ping A_hostname : OK

ping A_IP_Address: OK

net view \\A_hostname: System error 64 has occured. The specified network name is no longer available. Sometimes system error 53 has occured

net view \\A_IP_Address: System error 64 has occured. The specified network name is no longer available.

nbtstat -c: shows the entry for computer A correctly

Going to Network Places/Domain, double-clicking the Computer A shows the same error 'The specified network name is no longer available.'

Firewall on Computer A is turned off

Restarting Computer A doesn't help

Restarting Computer A's network card doesn't help

What could be the problem? I have feeling it's something wrong with netbios on Computer A, but did try many things, still not able to point out the problem.

SOLUTION

rastoi

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becraig

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crcsupport

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firewall is off for domain profile. But file and sharing is enabled.

I was able to generate the problem on another computer sending command 'net view \\A_hostname'.
When I disable SMB 2/3, from Windows 7 computer, it also shows system error 53. So, I guess it's smb related issue, not firewall or netbios.
But once I disable SMB 2/3 (it doesn't allow to disable only SMB 3, powershell command), I was not able to browse Computer A from all Windows version, xp,2003, 7. So, I guess somehow Computer doens't negotiate SMB down to SMB1 when 2003/xp browse to Computer A....

SOLUTION

becraig

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crcsupport

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PS C:\WINDOWS\system32> Get-SmbServerConfiguration | fl *

AnnounceComment :
AnnounceServer : False
AsynchronousCredits : 64
AutoDisconnectTimeout : 0
AutoShareServer : True
AutoShareWorkstation : True
CachedOpenLimit : 5
DurableHandleV2TimeoutInSeconds : 30
EnableAuthenticateUserSharing : True
EnableDownlevelTimewarp : False
EnableForcedLogoff : True
EnableLeasing : True
EnableMultiChannel : True
EnableOplocks : True
EnableSecuritySignature : False
EnableSMB1Protocol : True
EnableSMB2Protocol : False
EnableStrictNameChecking : True
EncryptData : False
IrpStackSize : 15
KeepAliveTime : 2
MaxChannelPerSession : 32
MaxMpxCount : 50
MaxSessionPerConnection : 16384
MaxThreadsPerQueue : 20
MaxWorkItems : 1
NullSessionPipes :
NullSessionShares :
OplockBreakWait : 35
PendingClientTimeoutInSeconds : 120
RejectUnencryptedAccess : True
RequireSecuritySignature : False
ServerHidden : True
Smb2CreditsMax : 2048
Smb2CreditsMin : 128
SmbServerNameHardeningLevel : 0
TreatHostAsStableStorage : False
ValidateAliasNotCircular : True
ValidateShareScope : True
ValidateShareScopeNotAliased : True
ValidateTargetName : True
PSComputerName :
CimClass : ROOT/Microsoft/Windows/SMB:MSFT_SmbServerConfiguration
CimInstanceProperties : {AnnounceComment, AnnounceServer, AsynchronousCredits,
AutoDisconnectTimeout...}
CimSystemProperties : Microsoft.Management.Infrastructure.CimSystemProperties

crcsupport

ASKER

Both Computer A and B, firewall is off

crcsupport

ASKER

One thing I noticed, I have two windows 8.1 computers. The other Windows 8.1 computer doesn't have this problem, all windows version OS can browse the computer with \\net view. So I compared the get-smbserverconfiguration, ont thing I noticed different;

Computer A(troubled computer):
EnableAuthenticateUserSharing : True

Computer C (working without any problme, all Windows (xp, 7, 8.1) can browse this compuer using net view \\C_hostname):
EnableAuthenticateUserSharing : False

I made this paramter on Computer A to 'False', but not working, but this is the only different value when I compare the two computers.

crcsupport

ASKER

I changed EnableAuthenticateUserSharing to False then restarted PC, it works PERFECT.
Anyone knows what this parameter is? I can't find good explanation in powershell manual..
I think this parameter was changed after windows update, my guess..

SOLUTION

becraig

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crcsupport

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Reading what that parameter is for besides share permission and NTFS security. It seems like internal seperate authentication of SMB...