diff --git a/inc/vCenter-SSL.ps1 b/inc/vCenter-SSL.ps1
index d0a78415..11f6f4cb 100644
--- a/inc/vCenter-SSL.ps1
+++ b/inc/vCenter-SSL.ps1
@@ -1,6 +1,6 @@
 #!/usr/bin/env pwsh
 # -----------------------------------------------------------------------------------
-# vCenter + Posh-ACME Script (Linux/macOS-safe, fixed HTTP content read)
+# vCenter + Posh-ACME Script (Linux/macOS-safe, HttpClient login)
 # -----------------------------------------------------------------------------------
 
 . /opt/idssys/nodemgmt/conf/powerwall/settings.ps1
@@ -105,25 +105,37 @@ if (-not (Get-Module -ListAvailable -Name Posh-ACME)) {
 Import-Module Posh-ACME -ErrorAction Stop
 
 # ----------------------------
-# Connect to vCenter API using Invoke-WebRequest
+# Connect to vCenter API using HttpClient (robust)
 # ----------------------------
-$loginUri = "https://$vCenterURL/rest/com/vmware/cis/session"
 Write-Host "Connecting to vCenter at $vCenterURL ..." -ForegroundColor Cyan
 
 try {
-    $resp = Invoke-WebRequest -Uri $loginUri -Method Post -SkipCertificateCheck -UseBasicParsing -Headers @{}
-    $json = $resp.Content | ConvertFrom-Json
-    $sessionToken = $json.value
-    if (-not $sessionToken) {
-        throw [System.Exception] "Unable to obtain vCenter session token"
+    $handler = [System.Net.Http.HttpClientHandler]::new()
+    $handler.ServerCertificateCustomValidationCallback = { $true }
+
+    $client = [System.Net.Http.HttpClient]::new($handler)
+    $client.Timeout = [System.TimeSpan]::FromSeconds(60)
+
+    $loginUri = "https://$vCenterURL/rest/com/vmware/cis/session"
+    $response = $client.PostAsync($loginUri, $null).GetAwaiter().GetResult()
+
+    if (-not $response.IsSuccessStatusCode) {
+        throw "vCenter session request failed: $($response.StatusCode)"
     }
+
+    $content = $response.Content.ReadAsStringAsync().GetAwaiter().GetResult()
+    $json = $content | ConvertFrom-Json
+    $sessionToken = $json.value
+
+    if (-not $sessionToken) { throw "Failed to obtain vCenter session token" }
+
+    $headers = @{ 'vmware-api-session-id' = $sessionToken }
+    Write-Host "Connected to vCenter API. Session established." -ForegroundColor Green
+
 } catch {
     Show-Failure -ErrorRecord $_
 }
 
-$headers = @{ 'vmware-api-session-id' = $sessionToken }
-Write-Host "Connected to vCenter API. Session established." -ForegroundColor Green
-
 # ----------------------------
 # Retrieve VM list (optional)
 # ----------------------------