diff --git a/Client/tauri-client/src-tauri/Cargo.toml b/Client/tauri-client/src-tauri/Cargo.toml
index 7901a420..96743742 100644
--- a/Client/tauri-client/src-tauri/Cargo.toml
+++ b/Client/tauri-client/src-tauri/Cargo.toml
@@ -23,7 +23,12 @@ tauri-plugin-global-shortcut = "2"
 tauri-plugin-notification = "2"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
-tauri-plugin-http = { version = "2.5.7", features = ["rustls-tls"] }
+# NOTE: dangerous-settings is required for self-signed certificate support.
+# The app is designed for self-hosted servers which commonly use self-signed certs.
+# The Rust TOFU WS proxy handles WebSocket certs, but HTTP API calls (health,
+# login, upload) and attachment downloads need this feature to accept self-signed
+# certs via the `danger` fetch option. Scoped to server URLs only in attachments.ts.
+tauri-plugin-http = { version = "2.5.7", features = ["rustls-tls", "dangerous-settings"] }
 tauri-plugin-opener = "2"
 tauri-plugin-dialog = "2"
 tauri-plugin-fs = "2"
diff --git a/Client/tauri-client/src/lib/types.ts b/Client/tauri-client/src/lib/types.ts
index d79862d6..6973b25a 100644
--- a/Client/tauri-client/src/lib/types.ts
+++ b/Client/tauri-client/src/lib/types.ts
@@ -497,7 +497,8 @@ export interface RegisterResponse {
 /** GET /api/health response. */
 export interface HealthResponse {
   readonly status: string;
-  readonly version: string;
+  /** Version is omitted from unauthenticated endpoints to prevent fingerprinting. */
+  readonly version?: string;
   readonly uptime: number;
   readonly online_users: number;
 }
diff --git a/Client/tauri-client/src/main.ts b/Client/tauri-client/src/main.ts
index 8a51ae48..b77c5e0c 100644
--- a/Client/tauri-client/src/main.ts
+++ b/Client/tauri-client/src/main.ts
@@ -85,10 +85,12 @@ if (!appEl) {
 
 // Create core services
 const router = createRouter("connect");
-// H-3: Default to strict TLS verification. Self-signed cert support is handled
-// by the Rust-side TOFU WS proxy and the CertMismatchModal, not by disabling
-// TLS validation in the HTTP client.
-const api = createApiClient({ host: "", allowSelfSigned: false }, () => {
+// NOTE: allowSelfSigned must be true because the app targets self-hosted servers
+// that commonly use self-signed certificates. The Rust TOFU WS proxy handles
+// WebSocket certs, but HTTP API calls (health, login, register, upload) have no
+// equivalent proxy and need this flag to function. The ideal future fix is adding
+// a TOFU HTTP proxy in Rust alongside the existing WS proxy.
+const api = createApiClient({ host: "", allowSelfSigned: true }, () => {
   log.warn("Session expired (401), clearing auth");
   clearAuth();
 });
@@ -195,7 +197,7 @@ function runHealthChecks(
         connectPage.updateHealthStatus(profile.host, {
           status: elapsed > 1500 ? "slow" : "online",
           latencyMs: elapsed,
-          version: health.version,
+          version: health.version ?? null,
           onlineUsers: health.online_users ?? null,
         });
       } catch {
diff --git a/Server/api/router_test.go b/Server/api/router_test.go
index cfc92ae0..40aebaf0 100644
--- a/Server/api/router_test.go
+++ b/Server/api/router_test.go
@@ -87,7 +87,7 @@ func TestHealthEndpointStatusOK(t *testing.T) {
 	}
 }
 
-func TestHealthEndpointHasVersion(t *testing.T) {
+func TestHealthEndpointOmitsVersion(t *testing.T) {
 	router := setupRouter(t)
 
 	req := httptest.NewRequest(http.MethodGet, "/health", nil)
@@ -100,8 +100,9 @@ func TestHealthEndpointHasVersion(t *testing.T) {
 		t.Fatalf("JSON decode error: %v", err)
 	}
 
-	if body["version"] == nil || body["version"] == "" {
-		t.Error("health response missing 'version' field")
+	// C-2: Version must NOT be exposed on unauthenticated endpoints.
+	if _, exists := body["version"]; exists {
+		t.Error("health response must not contain 'version' field (prevents fingerprinting)")
 	}
 }
 
@@ -136,7 +137,7 @@ func TestAPIV1InfoReturnsServerName(t *testing.T) {
 	}
 }
 
-func TestAPIV1InfoReturnsVersion(t *testing.T) {
+func TestAPIV1InfoOmitsVersion(t *testing.T) {
 	router := setupRouter(t)
 
 	req := httptest.NewRequest(http.MethodGet, "/api/v1/info", nil)
@@ -149,8 +150,9 @@ func TestAPIV1InfoReturnsVersion(t *testing.T) {
 		t.Fatalf("JSON decode error: %v", err)
 	}
 
-	if body["version"] == nil {
-		t.Error("info response missing 'version' field")
+	// C-2: Version must NOT be exposed to prevent fingerprinting.
+	if _, exists := body["version"]; exists {
+		t.Error("info response must not contain 'version' field (prevents fingerprinting)")
 	}
 }