This common SMB protocol issue occurs when Windows attempts to authenticate multiple shares on the same NAS using different credentials. The operating system's credential manager caches network authentication details per server, not per share, leading to conflicts.

The error manifests when:

net use * \\server\share /user:domain\username password

Windows maintains credential sessions in a single security context per server. When you attempt to access another share on the same NAS with different credentials, it triggers the error because:

1. First connection establishes security context (A)
2. Second connection attempts different context (B)
3. Windows blocks context B because A is already active

Method 1: Explicit Credential Specification

Use PowerShell to map drives with explicit credentials:

$cred = Get-Credential
New-PSDrive -Name "X" -PSProvider "FileSystem" -Root "\\NAS-IP\Share2" -Credential $cred -Persist

Method 2: Net Use with Saved Credentials

Clear existing connections first:

net use * /delete /y
net use X: \\NAS-IP\Share1 /user:user1 pass1 /persistent:yes
net use Y: \\NAS-IP\Share2 /user:user2 pass2 /persistent:yes

Using Runas with Saved Connections

runas /netonly /user:domain\user2 "explorer.exe"

Registry Modification (For Power Users)

Add this registry key to allow multiple credentials:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa]
"DisableLoopbackCheck"=dword:00000001

Check active sessions with:

klist sessions
klist tgt

To purge cached credentials:

cmdkey /delete:NAS-IP
cmdkey /delete:NAS-Hostname

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When working with multiple NAS shares requiring different credentials, Windows often throws this stubborn error: "The network folder specified is currently mapped using a different user name and password." This occurs because Windows caches credentials at the server level (192.168.2.5 in your case) rather than per share.

Windows' credential manager handles authentication at the server/IP level. When you attempt to connect to \\192.168.2.5\SHARE2 after already mapping \\192.168.2.5\SHARE1, Windows tries to reuse the cached credentials even if you explicitly provide different ones.

// What happens behind the scenes:
1. First connection: \\192.168.2.5\SHARE1 (credentials: user1/pass1)
2. Second attempt: \\192.168.2.5\SHARE2 (credentials: user2/pass2)
3. Windows automatically tries user1/pass1 instead

Method 1: Use FQDN or Different Addressing

Bypass credential caching by using different server identifiers:

net use Z: \\Nas-1dsho-abc\SHARE2 /user:domain\user2 *
(enter password when prompted)

Alternatively, use the NAS hostname for some shares and IP for others:

net use X: \\Nas-1dsho-abc\SHARE1 /user:user1 *
net use Y: \\192.168.2.5\SHARE2 /user:user2 *

Method 2: Clear Credentials Before Reconnecting

Use this PowerShell script to properly clear cached credentials:

# Clear specific credential
cmdkey /delete:192.168.2.5

# Or clear all credentials (careful!)
cmdkey /delete *

# Then map with new credentials
net use Z: \\192.168.2.5\SHARE2 /user:user2 *

Method 3: Registry Hack for Sticky Credentials

Add this registry entry to enable separate credential caching:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa]
"DisableLoopbackCheck"=dword:00000001

Create login scripts that properly handle multiple credentials:

@echo off
net use /delete \\192.168.2.5\* /y
net use X: \\192.168.2.5\SHARE1 /user:user1 /persistent:yes
net use Y: \\Nas-1dsho-abc\SHARE2 /user:user2 /persistent:yes

• Always check current mappings with net use
• For scripting, use /persistent:no to avoid credential caching
• Enterprise environments should consider Group Policy Preferences