diff --git a/app/sovran_systemsos_web/server.py b/app/sovran_systemsos_web/server.py
index 6844370..da23ac3 100644
--- a/app/sovran_systemsos_web/server.py
+++ b/app/sovran_systemsos_web/server.py
@@ -83,6 +83,7 @@ FEATURE_REGISTRY = [
         "needs_ddns": False,
         "extra_fields": [],
         "conflicts_with": [],
+        "port_requirements": [],
     },
     {
         "id": "haven",
@@ -102,6 +103,8 @@ FEATURE_REGISTRY = [
             },
         ],
         "conflicts_with": [],
+        # Haven uses only 80/443, already covered by the main install alert
+        "port_requirements": [],
     },
     {
         "id": "element-calling",
@@ -114,6 +117,15 @@ FEATURE_REGISTRY = [
         "extra_fields": [],
         "conflicts_with": [],
         "requires": ["matrix_domain"],
+        "port_requirements": [
+            {"port": "80",          "protocol": "TCP",     "description": "HTTP (redirect to HTTPS)"},
+            {"port": "443",         "protocol": "TCP",     "description": "HTTPS (domain)"},
+            {"port": "7881",        "protocol": "TCP",     "description": "LiveKit WebRTC signalling"},
+            {"port": "7882-7894",   "protocol": "UDP",     "description": "LiveKit media streams"},
+            {"port": "5349",        "protocol": "TCP",     "description": "TURN over TLS"},
+            {"port": "3478",        "protocol": "UDP",     "description": "TURN (STUN/relay)"},
+            {"port": "30000-40000", "protocol": "TCP/UDP", "description": "TURN relay (WebRTC)"},
+        ],
     },
     {
         "id": "mempool",
@@ -125,6 +137,7 @@ FEATURE_REGISTRY = [
         "needs_ddns": False,
         "extra_fields": [],
         "conflicts_with": [],
+        "port_requirements": [],
     },
     {
         "id": "bip110",
@@ -136,6 +149,7 @@ FEATURE_REGISTRY = [
         "needs_ddns": False,
         "extra_fields": [],
         "conflicts_with": ["bitcoin-core"],
+        "port_requirements": [],
     },
     {
         "id": "bitcoin-core",
@@ -147,6 +161,7 @@ FEATURE_REGISTRY = [
         "needs_ddns": False,
         "extra_fields": [],
         "conflicts_with": ["bip110"],
+        "port_requirements": [],
     },
 ]
 
@@ -160,6 +175,37 @@ FEATURE_SERVICE_MAP = {
     "bitcoin-core": None,
 }
 
+# Port requirements for service tiles (keyed by unit name or icon)
+# Services using only 80/443 for domain access share the same base list.
+_PORTS_WEB = [
+    {"port": "80",  "protocol": "TCP", "description": "HTTP (redirect to HTTPS)"},
+    {"port": "443", "protocol": "TCP", "description": "HTTPS"},
+]
+_PORTS_MATRIX_FEDERATION = _PORTS_WEB + [
+    {"port": "8448", "protocol": "TCP", "description": "Matrix server-to-server federation"},
+]
+_PORTS_ELEMENT_CALLING = _PORTS_WEB + [
+    {"port": "7881",        "protocol": "TCP",     "description": "LiveKit WebRTC signalling"},
+    {"port": "7882-7894",   "protocol": "UDP",     "description": "LiveKit media streams"},
+    {"port": "5349",        "protocol": "TCP",     "description": "TURN over TLS"},
+    {"port": "3478",        "protocol": "UDP",     "description": "TURN (STUN/relay)"},
+    {"port": "30000-40000", "protocol": "TCP/UDP", "description": "TURN relay (WebRTC)"},
+]
+
+SERVICE_PORT_REQUIREMENTS: dict[str, list[dict]] = {
+    # Infrastructure
+    "caddy.service":                    _PORTS_WEB,
+    # Communication
+    "matrix-synapse.service":           _PORTS_MATRIX_FEDERATION,
+    "livekit.service":                  _PORTS_ELEMENT_CALLING,
+    # Domain-based apps (80/443)
+    "btcpayserver.service":             _PORTS_WEB,
+    "vaultwarden.service":              _PORTS_WEB,
+    "phpfpm-nextcloud.service":         _PORTS_WEB,
+    "phpfpm-wordpress.service":         _PORTS_WEB,
+    "haven-relay.service":              _PORTS_WEB,
+}
+
 # For features that share a unit, disambiguate by icon field
 FEATURE_ICON_MAP = {
     "bip110": "bip110",
@@ -689,6 +735,8 @@ async def api_services():
         creds = entry.get("credentials", [])
         has_credentials = len(creds) > 0
 
+        port_requirements = SERVICE_PORT_REQUIREMENTS.get(unit, [])
+
         return {
             "name": entry.get("name", ""),
             "unit": unit,
@@ -698,6 +746,7 @@ async def api_services():
             "category": entry.get("category", "other"),
             "status": status,
             "has_credentials": has_credentials,
+            "port_requirements": port_requirements,
         }
 
     results = await asyncio.gather(*[get_status(s) for s in services])
@@ -910,6 +959,7 @@ async def api_features():
             "needs_ddns": feat.get("needs_ddns", False),
             "extra_fields": extra_fields,
             "conflicts_with": feat.get("conflicts_with", []),
+            "port_requirements": feat.get("port_requirements", []),
         }
         if "requires" in feat:
             entry["requires"] = feat["requires"]
diff --git a/app/sovran_systemsos_web/static/app.js b/app/sovran_systemsos_web/static/app.js
index 09e6f89..7308f57 100644
--- a/app/sovran_systemsos_web/static/app.js
+++ b/app/sovran_systemsos_web/static/app.js
@@ -113,6 +113,11 @@ const $featureConfirmOk      = document.getElementById("feature-confirm-ok-btn")
 const $featureConfirmCancel  = document.getElementById("feature-confirm-cancel-btn");
 const $featureConfirmClose   = document.getElementById("feature-confirm-close-btn");
 
+// Port Requirements modal
+const $portReqModal  = document.getElementById("port-requirements-modal");
+const $portReqBody   = document.getElementById("port-req-body");
+const $portReqClose  = document.getElementById("port-req-close-btn");
+
 // ── Helpers ───────────────────────────────────────────────────────
 
 function tileId(svc) { return svc.unit + "::" + svc.name; }
@@ -218,7 +223,16 @@ function buildTile(svc) {
   }
 
   var infoBtn = hasCreds ? '<button class="tile-info-btn" data-unit="' + escHtml(svc.unit) + '" title="Connection info">i</button>' : "";
-  tile.innerHTML = infoBtn + '<img class="tile-icon" src="/static/icons/' + escHtml(svc.icon) + '.svg" alt="' + escHtml(svc.name) + '" onerror="this.style.display=\'none\';this.nextElementSibling.style.display=\'flex\'"><div class="tile-icon-fallback" style="display:none">?</div><div class="tile-name">' + escHtml(svc.name) + '</div><div class="tile-status"><span class="status-dot ' + sc + '"></span><span class="status-text">' + st + '</span></div>';
+
+  // Port requirements badge
+  var ports = svc.port_requirements || [];
+  var portsHtml = "";
+  if (ports.length > 0) {
+    var portLabels = ports.map(function(p) { return escHtml(p.port) + ' (' + escHtml(p.protocol) + ')'; });
+    portsHtml = '<div class="tile-ports" title="Click to view required router ports"><span class="tile-ports-icon">🔌</span><span class="tile-ports-label">Ports: ' + portLabels.join(', ') + '</span></div>';
+  }
+
+  tile.innerHTML = infoBtn + '<img class="tile-icon" src="/static/icons/' + escHtml(svc.icon) + '.svg" alt="' + escHtml(svc.name) + '" onerror="this.style.display=\'none\';this.nextElementSibling.style.display=\'flex\'"><div class="tile-icon-fallback" style="display:none">?</div><div class="tile-name">' + escHtml(svc.name) + '</div><div class="tile-status"><span class="status-dot ' + sc + '"></span><span class="status-text">' + st + '</span></div>' + portsHtml;
 
   var infoBtnEl = tile.querySelector(".tile-info-btn");
   if (infoBtnEl) {
@@ -227,6 +241,16 @@ function buildTile(svc) {
       openCredsModal(svc.unit, svc.name);
     });
   }
+
+  var portsEl = tile.querySelector(".tile-ports");
+  if (portsEl) {
+    portsEl.style.cursor = "pointer";
+    portsEl.addEventListener("click", function(e) {
+      e.stopPropagation();
+      openPortRequirementsModal(svc.name, ports, null);
+    });
+  }
+
   return tile;
 }
 
@@ -883,6 +907,58 @@ function closeDomainSetupModal() {
   if ($domainSetupModal) $domainSetupModal.classList.remove("open");
 }
 
+// ── Port Requirements modal ───────────────────────────────────────
+
+function openPortRequirementsModal(featureName, ports, onContinue) {
+  if (!$portReqModal || !$portReqBody) return;
+
+  var rows = ports.map(function(p) {
+    return '<tr><td class="port-req-port">' + escHtml(p.port) + '</td>' +
+      '<td class="port-req-proto">' + escHtml(p.protocol) + '</td>' +
+      '<td class="port-req-desc">' + escHtml(p.description) + '</td></tr>';
+  }).join("");
+
+  var continueBtn = onContinue
+    ? '<button class="btn btn-primary" id="port-req-continue-btn">I Understand — Continue</button>'
+    : '';
+
+  $portReqBody.innerHTML =
+    '<p class="port-req-intro">You have enabled <strong>' + escHtml(featureName) + '</strong>. ' +
+    'For it to work with clients outside your local network you must open the following ports ' +
+    'on your <strong>home router / WAN firewall</strong>:</p>' +
+    '<table class="port-req-table">' +
+    '<thead><tr><th>Port(s)</th><th>Protocol</th><th>Purpose</th></tr></thead>' +
+    '<tbody>' + rows + '</tbody>' +
+    '</table>' +
+    '<p class="port-req-hint">ℹ Consult your router manual or search "<em>how to open ports on [router model]</em>" ' +
+    'for instructions. Features like Element Video Calling will not work for remote users until these ports are open.</p>' +
+    '<div class="domain-field-actions">' +
+    '<button class="btn btn-close-modal" id="port-req-dismiss-btn">Dismiss</button>' +
+    continueBtn +
+    '</div>';
+
+  document.getElementById("port-req-dismiss-btn").addEventListener("click", function() {
+    closePortRequirementsModal();
+  });
+
+  if (onContinue) {
+    document.getElementById("port-req-continue-btn").addEventListener("click", function() {
+      closePortRequirementsModal();
+      onContinue();
+    });
+  }
+
+  $portReqModal.classList.add("open");
+}
+
+function closePortRequirementsModal() {
+  if ($portReqModal) $portReqModal.classList.remove("open");
+}
+
+if ($portReqClose) {
+  $portReqClose.addEventListener("click", closePortRequirementsModal);
+}
+
 // ── Feature toggle logic ──────────────────────────────────────────
 
 async function performFeatureToggle(featId, enabled, extra) {
@@ -935,7 +1011,7 @@ function handleFeatureToggle(feat, newEnabled) {
     });
   }
 
-  function proceedAfterConflictCheck() {
+  function proceedAfterPortCheck() {
     // Check SSL email first
     if (!_featuresData || !_featuresData.ssl_email_configured) {
       if (feat.needs_domain) {
@@ -967,6 +1043,16 @@ function handleFeatureToggle(feat, newEnabled) {
     performFeatureToggle(feat.id, true, {});
   }
 
+  function proceedAfterConflictCheck() {
+    // Show port requirements notification if the feature has extra port needs
+    var ports = feat.port_requirements || [];
+    if (ports.length > 0) {
+      openPortRequirementsModal(feat.name, ports, proceedAfterPortCheck);
+    } else {
+      proceedAfterPortCheck();
+    }
+  }
+
   if (conflictNames.length > 0) {
     openFeatureConfirm(
       "This will disable " + conflictNames.join(", ") + ". Continue?",
diff --git a/app/sovran_systemsos_web/static/style.css b/app/sovran_systemsos_web/static/style.css
index a65ffa4..05f4c23 100644
--- a/app/sovran_systemsos_web/static/style.css
+++ b/app/sovran_systemsos_web/static/style.css
@@ -1311,3 +1311,82 @@ button.btn-reboot:hover:not(:disabled) {
     margin: 0 12px;
   }
 }
+
+/* ── Tile: Port Requirements badge ──────────────────────────────── */
+
+.tile-ports {
+  margin-top: 6px;
+  font-size: 0.7rem;
+  color: var(--text-secondary);
+  display: flex;
+  align-items: flex-start;
+  gap: 4px;
+  line-height: 1.4;
+  flex-wrap: wrap;
+}
+
+.tile-ports:hover {
+  color: var(--accent-color);
+}
+
+.tile-ports-icon {
+  flex-shrink: 0;
+}
+
+.tile-ports-label {
+  word-break: break-word;
+}
+
+/* ── Port Requirements Modal ────────────────────────────────────── */
+
+.port-req-intro {
+  font-size: 0.9rem;
+  color: var(--text-primary);
+  margin-bottom: 14px;
+  line-height: 1.5;
+}
+
+.port-req-table {
+  width: 100%;
+  border-collapse: collapse;
+  font-size: 0.85rem;
+  margin-bottom: 14px;
+}
+
+.port-req-table thead th {
+  text-align: left;
+  padding: 6px 10px;
+  border-bottom: 1px solid var(--border-color);
+  color: var(--text-secondary);
+  font-weight: 600;
+}
+
+.port-req-table tbody tr:nth-child(even) {
+  background-color: rgba(255,255,255,0.03);
+}
+
+.port-req-port {
+  padding: 5px 10px;
+  font-family: 'JetBrains Mono', monospace;
+  font-size: 0.82rem;
+  color: var(--accent-color);
+  white-space: nowrap;
+}
+
+.port-req-proto {
+  padding: 5px 10px;
+  color: var(--text-secondary);
+  white-space: nowrap;
+}
+
+.port-req-desc {
+  padding: 5px 10px;
+  color: var(--text-primary);
+}
+
+.port-req-hint {
+  font-size: 0.78rem;
+  color: var(--text-dim);
+  line-height: 1.5;
+  margin-bottom: 14px;
+}
diff --git a/app/sovran_systemsos_web/templates/index.html b/app/sovran_systemsos_web/templates/index.html
index f0e9bd0..618528e 100644
--- a/app/sovran_systemsos_web/templates/index.html
+++ b/app/sovran_systemsos_web/templates/index.html
@@ -129,6 +129,17 @@
     </div>
   </div>
 
+  <!-- Port Requirements Modal -->
+  <div class="modal-overlay" id="port-requirements-modal" role="dialog" aria-modal="true" aria-labelledby="port-req-title">
+    <div class="creds-dialog">
+      <div class="creds-header">
+        <span class="creds-title" id="port-req-title">🔌 Router / Firewall Port Requirements</span>
+        <button class="creds-close-btn" id="port-req-close-btn" title="Close">✕</button>
+      </div>
+      <div class="creds-body" id="port-req-body"></div>
+    </div>
+  </div>
+
   <!-- Rebuild Modal -->
   <div class="modal-overlay" id="rebuild-modal" role="dialog" aria-modal="true" aria-labelledby="rebuild-modal-title">
     <div class="modal-dialog">
diff --git a/iso/installer.py b/iso/installer.py
index 1e10b84..cf73713 100644
--- a/iso/installer.py
+++ b/iso/installer.py
@@ -341,7 +341,110 @@ class InstallerWindow(Adw.ApplicationWindow):
             if radio.get_active():
                 self.role = radio.get_name()
                 break
-        self.push_disk_confirm()
+        self.push_port_requirements()
+
+    # ── Step 1b: Port Requirements Notice ─────────────────────────────────
+
+    def push_port_requirements(self):
+        """Inform the user about required router/firewall ports before install."""
+        outer = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=0)
+
+        # Warning banner
+        banner = Adw.Banner()
+        banner.set_title(
+            "⚠  You must open these ports on your home router / WAN firewall"
+        )
+        banner.set_revealed(True)
+        banner.set_margin_top(16)
+        banner.set_margin_start(40)
+        banner.set_margin_end(40)
+        outer.append(banner)
+
+        intro = Gtk.Label()
+        intro.set_markup(
+            "<span foreground='#a6adc8'>"
+            "Many Sovran_SystemsOS features require specific ports to be forwarded "
+            "through your router for remote access to work correctly. "
+            "Services like Element Video/Audio Calling and Matrix Federation "
+            "<b>will not work for clients outside your LAN</b> unless these ports are open."
+            "</span>"
+        )
+        intro.set_wrap(True)
+        intro.set_justify(Gtk.Justification.FILL)
+        intro.set_margin_top(14)
+        intro.set_margin_start(40)
+        intro.set_margin_end(40)
+        outer.append(intro)
+
+        sw = Gtk.ScrolledWindow()
+        sw.set_policy(Gtk.PolicyType.AUTOMATIC, Gtk.PolicyType.AUTOMATIC)
+        sw.set_vexpand(True)
+        sw.set_margin_start(40)
+        sw.set_margin_end(40)
+        sw.set_margin_top(12)
+        sw.set_margin_bottom(8)
+
+        ports_box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=12)
+
+        port_sections = [
+            (
+                "🌐  Web / HTTPS  (all domain-based services)",
+                [("80", "TCP", "HTTP (redirects to HTTPS)"),
+                 ("443", "TCP", "HTTPS")],
+            ),
+            (
+                "💬  Matrix Federation  (Matrix-Synapse)",
+                [("8448", "TCP", "Server-to-server federation")],
+            ),
+            (
+                "🎥  Element Video & Audio Calling  (LiveKit / Element-call)",
+                [("7881",         "TCP",     "LiveKit WebRTC signalling"),
+                 ("7882-7894",    "UDP",     "LiveKit media streams"),
+                 ("5349",         "TCP",     "TURN over TLS"),
+                 ("3478",         "UDP",     "TURN (STUN / relay)"),
+                 ("30000-40000",  "TCP/UDP", "TURN relay (WebRTC media)")],
+            ),
+            (
+                "🖥  Remote SSH  (optional — only if you want WAN SSH access)",
+                [("22", "TCP", "SSH")],
+            ),
+        ]
+
+        for section_title, rows in port_sections:
+            group = Adw.PreferencesGroup()
+            group.set_title(section_title)
+
+            for port, proto, desc in rows:
+                row = Adw.ActionRow()
+                row.set_title(f"Port {port}  ({proto})")
+                row.set_subtitle(desc)
+                group.add(row)
+
+            ports_box.append(group)
+
+        note = Gtk.Label()
+        note.set_markup(
+            "<span foreground='#6c7086' size='small'>"
+            "ℹ  Search \"<i>how to open ports on [your router model]</i>\" for step-by-step instructions. "
+            "Most home routers have a \"Port Forwarding\" section in their admin panel."
+            "</span>"
+        )
+        note.set_wrap(True)
+        note.set_justify(Gtk.Justification.FILL)
+        note.set_margin_top(8)
+        ports_box.append(note)
+
+        sw.set_child(ports_box)
+        outer.append(sw)
+
+        outer.append(self.nav_row(
+            back_label="←  Back",
+            back_cb=lambda b: self.nav.pop(),
+            next_label="I Understand  →",
+            next_cb=lambda b: self.push_disk_confirm(),
+        ))
+
+        self.push_page("Network Port Requirements", outer, show_back=True)
 
     # ── Step 2: Disk Confirm ───────────────────────────────────────────────