diff --git a/agent/src/collectors/service.rs b/agent/src/collectors/service.rs
index 2a902ea..81458a8 100644
--- a/agent/src/collectors/service.rs
+++ b/agent/src/collectors/service.rs
@@ -637,9 +637,42 @@ impl ServiceCollector {
     async fn get_nginx_sites(&self) -> Option<Vec<String>> {
         tracing::debug!("Starting nginx site detection");
         
-        // For NixOS and other systems, get the actual running nginx config
+        // Get the actual nginx config file path from systemd (NixOS uses custom config)
+        let config_path = match self.get_nginx_config_from_systemd().await {
+            Some(path) => {
+                tracing::debug!("Found nginx config path from systemd: {}", path);
+                path
+            }
+            None => {
+                tracing::warn!("Could not find nginx config path from systemd, using default");
+                // Fallback to default nginx -T
+                match Command::new("sudo")
+                    .args(["nginx", "-T"])
+                    .stdout(Stdio::piped())
+                    .stderr(Stdio::piped())
+                    .output()
+                    .await
+                {
+                    Ok(output) => {
+                        if !output.status.success() {
+                            let stderr = String::from_utf8_lossy(&output.stderr);
+                            tracing::warn!("nginx -T failed with status {}: {}", output.status, stderr);
+                            return None;
+                        }
+                        let config = String::from_utf8_lossy(&output.stdout);
+                        return self.parse_nginx_config(&config);
+                    }
+                    Err(e) => {
+                        tracing::warn!("Failed to execute sudo nginx -T: {}", e);
+                        return None;
+                    }
+                }
+            }
+        };
+        
+        // Use the specific config file
         let output = match Command::new("sudo")
-            .args(["nginx", "-T"])
+            .args(["nginx", "-T", "-c", &config_path])
             .stdout(Stdio::piped())
             .stderr(Stdio::piped())
             .output()
@@ -647,7 +680,7 @@ impl ServiceCollector {
         {
             Ok(output) => output,
             Err(e) => {
-                tracing::warn!("Failed to execute sudo nginx -T: {}", e);
+                tracing::warn!("Failed to execute sudo nginx -T -c {}: {}", config_path, e);
                 return None;
             }
         };
@@ -661,6 +694,43 @@ impl ServiceCollector {
         let config = String::from_utf8_lossy(&output.stdout);
         tracing::debug!("Got nginx config, {} bytes", config.len());
         
+        self.parse_nginx_config(&config)
+    }
+    
+    async fn get_nginx_config_from_systemd(&self) -> Option<String> {
+        let output = Command::new("systemctl")
+            .args(["show", "nginx", "--property=ExecStart", "--no-pager"])
+            .stdout(Stdio::piped())
+            .stderr(Stdio::piped())
+            .output()
+            .await
+            .ok()?;
+            
+        if !output.status.success() {
+            return None;
+        }
+        
+        let stdout = String::from_utf8_lossy(&output.stdout);
+        // Parse ExecStart to extract -c config path
+        for line in stdout.lines() {
+            if line.starts_with("ExecStart=") {
+                // Look for "-c /path/to/config" in the command line
+                if let Some(c_index) = line.find(" -c ") {
+                    let after_c = &line[c_index + 4..];
+                    if let Some(space_index) = after_c.find(' ') {
+                        return Some(after_c[..space_index].to_string());
+                    } else {
+                        // -c is the last argument, clean up systemd formatting
+                        let cleaned = after_c.trim_end_matches(" ; ignore_errors=no ; start_time=[n/a] ; stop_time=[n/a] ; pid=0 ; code=(null) ; status=0/0 }");
+                        return Some(cleaned.to_string());
+                    }
+                }
+            }
+        }
+        None
+    }
+    
+    fn parse_nginx_config(&self, config: &str) -> Option<Vec<String>> {
         let mut sites = Vec::new();
         let mut server_name_lines = 0;