SHORT ANSWER
if(-Not(Test-Path "filesystem::\\$server\c$")) {Write-Error "Server not found: $server"; continue}
If Test-Path fails unexpectedly then make sure SMB2=1 (or other SMB setting) is set on both client and target server.
MORE INFO
IMPORTANT SMB NOTE: Both current system and target system must have at least on common SMB protocol enabled for Test-Path to succeed. (SMB2 or later strongly recommended.) For example, if target has SMB1 enabled + SMB2 disabled and client has only SMB2 enabled then logic above will return "Server not found...". This threw me off track until I finally checked my target server (Win7) and found it had SMB2=0 (disabled) and no entry for SMB1 (enabled by default). I fixed by setting SMB2=1 per article below.
SMB OS-specific and scripting details: https://support.microsoft.com/en-us/help/2696547/detect-enable-disable-smbv1-smbv2-smbv3-in-windows-and-windows-server
Excerpt: Win8/Win20012
Detect: Get-SmbServerConfiguration | Select EnableSMB1Protocol
Disable: Set-SmbServerConfiguration -EnableSMB1Protocol $false
Enable: Set-SmbServerConfiguration -EnableSMB1Protocol $true
Excerpt: Win7/Win2008R2Server
Detect:
Get-Item HKLM:\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters | ForEach-Object {Get-ItemProperty $_.pspath}
Default configuration = Enabled (No registry key is created), so no SMB1 value will be returned
Disable:
Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters" SMB1 -Type DWORD -Value 0 –Force
Enable:
Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters" SMB1 -Type DWORD -Value 1 –Force
Code sample: Copy-Item a folder (recursive) only if target server exists
$scriptRootPath="."
$scriptToolsPath="$scriptRootPath\Tools"
$targetServerList="$scriptToolsPath\DeployServerList-INT-POC.txt" #DeployServerList-INT.txt, DeployServerList-QA.txt, DeployServerList-PROD.txt
$stageTargetDrive="c"
$stageFolderPath="$stageTargetDrive$\staging"
$VerbosePreference="Continue" #"SilentlyContinue" (default), "Continue", "Stop", "Inquire"
$InformationPreference="Continue"
Write-Host "Getting list of servers from $targetServerList to stage deployment files to..."
$serverList = (get-content "$targetServerList")
Write-Verbose "scriptToolsPath=$scriptToolsPath"
Write-Verbose "serverlist=$serverList"
Write-Verbose "stageFolderPath=$StageFolderPath"
Write-Host -Separator "-"
Read-Host -Prompt "READY TO STAGE FILES: Check info above, then press Enter to continue (or Ctrl+C to exit)."
Write-Host "-------------------------------------------------"
Write-Host "Staging files to $stageFolderPath on each target server..."
foreach ($server in $serverlist) {
# Input validation
if([string]::IsNullOrWhiteSpace($server)) {continue}
if($server.StartsWith("#")) {Write-Verbose "Comment skipped: $server"; continue} # Skip line if line begins with hashtag comment char
Write-Verbose "Testing filesystem access to $server..."
if(-Not(Test-Path "filesystem::\\$server\$stageTargetDrive$")) {Write-Error "Server not found: $server"; continue}
# TIP: If Test-Path returns false unexpectedly then check if SMB2 is enabled on target server, check SMB1 disabled for both src and target servers.
Write-Verbose "Staging files to $server..."
Copy-Item ".\" -Destination "\\$server\$stageFolderPath" -Recurse -Force -ErrorAction Continue
Write-Information "Files staged on $server."
}