diff --git a/agent/src/collectors/service.rs b/agent/src/collectors/service.rs
index 80748ea..f051fe5 100644
--- a/agent/src/collectors/service.rs
+++ b/agent/src/collectors/service.rs
@@ -622,70 +622,42 @@ impl ServiceCollector {
     }
 
     async fn get_nginx_sites(&self) -> Option<Vec<String>> {
-        // Check enabled sites in sites-enabled directory
-        let sites_enabled_dir = "/etc/nginx/sites-enabled";
-        
-        let mut entries = match fs::read_dir(sites_enabled_dir).await {
-            Ok(entries) => entries,
-            Err(_) => return None,
-        };
+        // For NixOS and other systems, get the actual running nginx config
+        let output = Command::new("nginx")
+            .args(["-T"])
+            .stdout(Stdio::piped())
+            .stderr(Stdio::piped())
+            .output()
+            .await
+            .ok()?;
 
+        if !output.status.success() {
+            return None;
+        }
+
+        let config = String::from_utf8_lossy(&output.stdout);
         let mut sites = Vec::new();
         
-        while let Ok(Some(entry)) = entries.next_entry().await {
-            let path = entry.path();
-            
-            // Skip if it's not a file or is a symlink to default
-            if !path.is_file() {
-                continue;
-            }
-            
-            let filename = path.file_name()?.to_string_lossy();
-            
-            // Skip default site unless it's the only one
-            if filename == "default" {
-                continue;
-            }
-            
-            // Try to extract server names from the config file
-            if let Ok(config_content) = fs::read_to_string(&path).await {
-                let mut server_names = Vec::new();
-                
-                for line in config_content.lines() {
-                    let trimmed = line.trim();
-                    if trimmed.starts_with("server_name") {
-                        // Extract server names from "server_name example.com www.example.com;"
-                        if let Some(names_part) = trimmed.strip_prefix("server_name") {
-                            let names_clean = names_part.trim().trim_end_matches(';');
-                            for name in names_clean.split_whitespace() {
-                                if name != "_" && !name.is_empty() {
-                                    server_names.push(name.to_string());
-                                    break; // Only take the first valid server name
-                                }
-                            }
+        for line in config.lines() {
+            let trimmed = line.trim();
+            if trimmed.starts_with("server_name") {
+                // Extract server names from "server_name example.com www.example.com;"
+                if let Some(names_part) = trimmed.strip_prefix("server_name") {
+                    let names_clean = names_part.trim().trim_end_matches(';');
+                    for name in names_clean.split_whitespace() {
+                        // Skip default catch-all server names
+                        if name != "_" && !name.is_empty() && name.contains('.') && !name.starts_with('$') {
+                            sites.push(name.to_string());
                         }
                     }
                 }
-                
-                if !server_names.is_empty() {
-                    sites.push(server_names[0].clone());
-                } else {
-                    // Fallback to filename if no server_name found
-                    sites.push(filename.to_string());
-                }
-            } else {
-                // Fallback to filename if can't read config
-                sites.push(filename.to_string());
             }
         }
         
-        // If no sites found, check for default
-        if sites.is_empty() {
-            let default_path = format!("{}/default", sites_enabled_dir);
-            if fs::metadata(&default_path).await.is_ok() {
-                sites.push("default".to_string());
-            }
-        }
+        // Remove duplicates and limit to reasonable number
+        sites.sort();
+        sites.dedup();
+        sites.truncate(15); // Show max 15 sites to avoid overwhelming the UI
         
         if sites.is_empty() {
             None