diff --git a/plugins/remote-desktop/src/frontend/GuacamoleApp.tsx b/plugins/remote-desktop/src/frontend/GuacamoleApp.tsx
index cea630725..c95a5ef18 100644
--- a/plugins/remote-desktop/src/frontend/GuacamoleApp.tsx
+++ b/plugins/remote-desktop/src/frontend/GuacamoleApp.tsx
@@ -639,6 +639,8 @@ const GuacamoleAppInner = React.forwardRef<
                   sessionId: guacamoleConnectionId,
                   protocol: resolvedProtocol,
                   tabInstanceId: tabId,
+                  origin:
+                    sessionLookup?.origin === "remote" ? "remote" : "local",
                 }
               : undefined
           }
diff --git a/plugins/remote-desktop/src/frontend/GuacamoleToolbar.tsx b/plugins/remote-desktop/src/frontend/GuacamoleToolbar.tsx
index 3cd2ad7c8..c66bb05f4 100644
--- a/plugins/remote-desktop/src/frontend/GuacamoleToolbar.tsx
+++ b/plugins/remote-desktop/src/frontend/GuacamoleToolbar.tsx
@@ -64,6 +64,8 @@ export interface RemoteDesktopToolbarContext {
   sessionId: string | null;
   protocol: "rdp" | "vnc" | "telnet";
   tabInstanceId?: string;
+  /** The backend the session runs on. */
+  origin?: "local" | "remote";
 }
 
 const MODIFIER_KEYSYMS = {
diff --git a/plugins/session-sharing/locales/en.json b/plugins/session-sharing/locales/en.json
index 739ce3723..d1b826ee0 100644
--- a/plugins/session-sharing/locales/en.json
+++ b/plugins/session-sharing/locales/en.json
@@ -30,6 +30,7 @@
     "searchUsersPlaceholder": "Search users...",
     "noUsersFound": "No users found",
     "linkCreated": "Share link created",
+    "linkNeedsServer": "Share links only work for sessions on a Termix server. Connect this host through your linked server to share it with a link.",
     "linkCopied": "Link copied to clipboard",
     "copyLink": "Copy link",
     "shareCreated": "Session shared. It will appear in their Connections tab.",
diff --git a/plugins/session-sharing/src/frontend/ShareSessionModal.tsx b/plugins/session-sharing/src/frontend/ShareSessionModal.tsx
index 9e0fb61dd..2f80e7f8b 100644
--- a/plugins/session-sharing/src/frontend/ShareSessionModal.tsx
+++ b/plugins/session-sharing/src/frontend/ShareSessionModal.tsx
@@ -25,7 +25,9 @@ import {
   type SessionSharePermissionLevel,
   type SessionShareRecord,
   getDirectory,
+  type SessionOrigin,
 } from "./api";
+import { guestViewUrl } from "./meeting-backend";
 
 const EXPIRY_PRESETS = [
   { key: "oneHour", hours: 1 },
@@ -44,6 +46,8 @@ export function ShareSessionModal({
   sessionId,
   protocol,
   tabInstanceId,
+  origin,
+  resolvePublicUrl,
 }: {
   open: boolean;
   onClose: () => void;
@@ -51,6 +55,8 @@ export function ShareSessionModal({
   sessionId: string | null;
   protocol: SessionShareProtocol;
   tabInstanceId?: string;
+  origin?: SessionOrigin;
+  resolvePublicUrl?: (origin?: SessionOrigin) => Promise<string | null>;
 }) {
   const { t } = useTranslation();
   const [mode, setMode] = useState<"link" | "user">("link");
@@ -83,8 +89,8 @@ export function ShareSessionModal({
     if (!open || sharesLoaded) return;
     setSharesLoaded(true);
     Promise.all([
-      getDirectory().catch(() => ({ users: [] })),
-      getActiveSessionShares(hostId).catch(() => ({ shares: [] })),
+      getDirectory(origin).catch(() => ({ users: [] })),
+      getActiveSessionShares(hostId, origin).catch(() => ({ shares: [] })),
     ]).then(([usersRes, sharesRes]) => {
       setUsers(
         (usersRes.users ?? []).map((u) => ({
@@ -94,7 +100,7 @@ export function ShareSessionModal({
       );
       setShares(sharesRes.shares ?? []);
     });
-  }, [open, hostId, sharesLoaded]);
+  }, [open, hostId, origin, sharesLoaded]);
 
   const filteredUsers = useMemo(() => {
     const q = search.trim().toLowerCase();
@@ -113,7 +119,7 @@ export function ShareSessionModal({
 
   async function refreshShares() {
     try {
-      const res = await getActiveSessionShares(hostId);
+      const res = await getActiveSessionShares(hostId, origin);
       setShares(res.shares ?? []);
     } catch {
       // silently ignore
@@ -127,21 +133,33 @@ export function ShareSessionModal({
 
     setSubmitting(true);
     try {
-      const result = await createSessionShare({
-        hostId,
-        sessionId,
-        tabInstanceId,
-        protocol,
-        shareType: mode,
-        targetUserId:
-          mode === "user" ? (selectedUserId ?? undefined) : undefined,
-        permissionLevel,
-        expiryHours,
-      });
+      const base =
+        mode === "link"
+          ? resolvePublicUrl
+            ? await resolvePublicUrl(origin)
+            : window.location.href
+          : null;
+      if (mode === "link" && !guestViewUrl(base, "shared", "check")) {
+        toast.error(t("sessionSharing.linkNeedsServer"));
+        return;
+      }
+      const result = await createSessionShare(
+        {
+          hostId,
+          sessionId,
+          tabInstanceId,
+          protocol,
+          shareType: mode,
+          targetUserId:
+            mode === "user" ? (selectedUserId ?? undefined) : undefined,
+          permissionLevel,
+          expiryHours,
+        },
+        origin,
+      );
 
       if (mode === "link" && result.linkToken) {
-        const url = `${window.location.origin}${window.location.pathname}?view=shared&token=${result.linkToken}`;
-        setCreatedLink(url);
+        setCreatedLink(guestViewUrl(base, "shared", result.linkToken));
         toast.success(t("sessionSharing.linkCreated"));
       } else {
         toast.success(t("sessionSharing.shareCreated"));
@@ -172,7 +190,7 @@ export function ShareSessionModal({
 
   async function handleRevoke(shareId: string) {
     try {
-      await revokeSessionShare(shareId);
+      await revokeSessionShare(shareId, origin);
       setShares((prev) => prev.filter((s) => s.id !== shareId));
       toast.success(t("sessionSharing.revoked"));
     } catch {
diff --git a/plugins/session-sharing/src/frontend/api.ts b/plugins/session-sharing/src/frontend/api.ts
index 947228174..8f50ac92a 100644
--- a/plugins/session-sharing/src/frontend/api.ts
+++ b/plugins/session-sharing/src/frontend/api.ts
@@ -5,16 +5,24 @@ import type { PluginApiClient } from "@termix/plugin-sdk/frontend";
  * Guest pages use it too: the two guest routes are public.
  */
 let client: PluginApiClient | null = null;
+let clientFor: ((origin?: unknown) => PluginApiClient) | null = null;
 
-export function bindApi(api: PluginApiClient | null): void {
+export function bindApi(
+  api: PluginApiClient | null,
+  apiFor?: (origin?: unknown) => PluginApiClient,
+): void {
   client = api;
+  clientFor = api ? (apiFor ?? null) : null;
 }
 
-function api(): PluginApiClient {
+/** The session lives on the backend its tab connected through. */
+function api(origin?: SessionOrigin): PluginApiClient {
   if (!client) throw new Error("Session sharing is not running");
-  return client;
+  return origin && clientFor ? clientFor(origin) : client;
 }
 
+export type SessionOrigin = "local" | "remote";
+
 interface HttpError {
   response?: { status?: number; data?: { error?: string } };
 }
@@ -134,25 +142,33 @@ export interface CreateSessionShareResponse {
 
 export function createSessionShare(
   request: CreateSessionShareRequest,
+  origin?: SessionOrigin,
 ): Promise<CreateSessionShareResponse> {
   return call(
-    () => api().post<CreateSessionShareResponse>("/create", request),
+    () => api(origin).post<CreateSessionShareResponse>("/create", request),
     "Failed to create session share",
   );
 }
 
 export function getActiveSessionShares(
   hostId: number,
+  origin?: SessionOrigin,
 ): Promise<{ shares: SessionShareRecord[] }> {
   return call(
-    () => api().get<{ shares: SessionShareRecord[] }>(`/host/${hostId}/active`),
+    () =>
+      api(origin).get<{ shares: SessionShareRecord[] }>(
+        `/host/${hostId}/active`,
+      ),
     "Failed to fetch active session shares",
   );
 }
 
-export function revokeSessionShare(shareId: string): Promise<unknown> {
+export function revokeSessionShare(
+  shareId: string,
+  origin?: SessionOrigin,
+): Promise<unknown> {
   return call(
-    () => api().delete(`/${encodeURIComponent(shareId)}`),
+    () => api(origin).delete(`/${encodeURIComponent(shareId)}`),
     "Failed to revoke session share",
   );
 }
@@ -169,13 +185,13 @@ export interface DirectoryRole {
 }
 
 /** Users and roles to share with or invite. */
-export function getDirectory(): Promise<{
+export function getDirectory(origin?: SessionOrigin): Promise<{
   users: DirectoryUser[];
   roles: DirectoryRole[];
 }> {
   return call(
     () =>
-      api().get<{ users: DirectoryUser[]; roles: DirectoryRole[] }>(
+      api(origin).get<{ users: DirectoryUser[]; roles: DirectoryRole[] }>(
         "/directory",
       ),
     "Failed to list users and roles",
diff --git a/plugins/session-sharing/src/frontend/index.tsx b/plugins/session-sharing/src/frontend/index.tsx
index 2bfd69fc2..a794b5fbd 100644
--- a/plugins/session-sharing/src/frontend/index.tsx
+++ b/plugins/session-sharing/src/frontend/index.tsx
@@ -26,6 +26,7 @@ import SharedSessionView from "./SharedSessionView";
 import { ParticipantsOverlay } from "./ParticipantsOverlay";
 import {
   ShareDialogHost,
+  bindShareApp,
   closeShareDialog,
   openShareDialog,
   type ShareTarget,
@@ -217,6 +218,7 @@ interface RemoteDesktopToolbarContext {
   sessionId: string | null;
   protocol: "rdp" | "vnc" | "telnet";
   tabInstanceId?: string;
+  origin?: "local" | "remote";
 }
 
 function isRemoteDesktopContext(
@@ -232,10 +234,12 @@ function isRemoteDesktopContext(
 
 export function activate(app: TermixApp): void {
   meetingApp = app;
-  bindApi(app.api);
+  bindApi(app.api, app.apiFor);
+  bindShareApp(app);
   app.onDispose(() => {
     closeShareDialog();
     bindApi(null);
+    bindShareApp(null);
   });
 
   // Rooms and share links draw remote desktop streams through this slot.
@@ -281,6 +285,7 @@ export function activate(app: TermixApp): void {
               sessionId: context.sessionId,
               protocol: context.protocol,
               tabInstanceId: context.tabInstanceId,
+              origin: context.origin,
             }
           : null;
       } else {
diff --git a/plugins/session-sharing/src/frontend/meeting-backend.ts b/plugins/session-sharing/src/frontend/meeting-backend.ts
index 6dfe04c9d..03c0c18de 100644
--- a/plugins/session-sharing/src/frontend/meeting-backend.ts
+++ b/plugins/session-sharing/src/frontend/meeting-backend.ts
@@ -32,13 +32,32 @@ export async function connectMeetings(app: TermixApp) {
 export function meetingGuestUrl(
   publicUrl: string | null,
   token: string,
+): string | null {
+  return guestViewUrl(publicUrl, "collab-guest", token);
+}
+
+/** A guest link on a server others can open, never a file:// desktop page. */
+export function guestViewUrl(
+  publicUrl: string | null,
+  view: string,
+  token: string,
 ): string | null {
   if (!publicUrl) return null;
   const url = new URL(publicUrl);
   if (url.protocol !== "http:" && url.protocol !== "https:") return null;
   url.search = "";
   url.hash = "";
-  url.searchParams.set("view", "collab-guest");
+  url.searchParams.set("view", view);
   url.searchParams.set("token", token);
   return url.toString();
 }
+
+/** Where guests reach a session that runs on the given backend. */
+export async function sessionPublicUrl(
+  app: TermixApp,
+  origin: "local" | "remote" | undefined,
+): Promise<string | null> {
+  if (!app.desktop.available) return window.location.href;
+  if (origin !== "remote") return null;
+  return (await app.desktop.remoteServerUrl()) || null;
+}
diff --git a/plugins/session-sharing/src/frontend/share-dialog.tsx b/plugins/session-sharing/src/frontend/share-dialog.tsx
index 9f55a2905..487a8ea0b 100644
--- a/plugins/session-sharing/src/frontend/share-dialog.tsx
+++ b/plugins/session-sharing/src/frontend/share-dialog.tsx
@@ -1,6 +1,21 @@
 import { useSyncExternalStore } from "react";
+import type { TermixApp } from "@termix/plugin-sdk/frontend";
 import { ShareSessionModal } from "./ShareSessionModal";
 import type { SessionShareProtocol } from "./api";
+import { sessionPublicUrl } from "./meeting-backend";
+
+let shareApp: TermixApp | null = null;
+
+export function bindShareApp(app: TermixApp | null): void {
+  shareApp = app;
+}
+
+function resolveShareBase(
+  origin: "local" | "remote" | undefined,
+): Promise<string | null> {
+  if (!shareApp) return Promise.resolve(window.location.href);
+  return sessionPublicUrl(shareApp, origin);
+}
 
 /** What the share dialog needs to share one live session. */
 export interface ShareTarget {
@@ -8,6 +23,8 @@ export interface ShareTarget {
   sessionId: string;
   protocol: SessionShareProtocol;
   tabInstanceId?: string;
+  /** The backend the session runs on; a desktop can be on either. */
+  origin?: "local" | "remote";
 }
 
 let current: ShareTarget | null = null;
@@ -45,6 +62,8 @@ export function ShareDialogHost() {
       sessionId={target.sessionId}
       protocol={target.protocol}
       tabInstanceId={target.tabInstanceId}
+      origin={target.origin}
+      resolvePublicUrl={resolveShareBase}
     />
   );
 }
diff --git a/plugins/session-sharing/tests/frontend/share-link-url.test.ts b/plugins/session-sharing/tests/frontend/share-link-url.test.ts
new file mode 100644
index 000000000..d3716ebda
--- /dev/null
+++ b/plugins/session-sharing/tests/frontend/share-link-url.test.ts
@@ -0,0 +1,38 @@
+import { describe, expect, it } from "vitest";
+import type { TermixApp } from "@termix/plugin-sdk/frontend";
+import {
+  guestViewUrl,
+  sessionPublicUrl,
+} from "../../src/frontend/meeting-backend";
+
+function desktop(url: string | null): TermixApp {
+  return {
+    desktop: { available: true, remoteServerUrl: async () => url },
+  } as unknown as TermixApp;
+}
+
+describe("session share links", () => {
+  it("builds the link on the linked server for a remote session", async () => {
+    const base = await sessionPublicUrl(
+      desktop("https://termix.example/"),
+      "remote",
+    );
+    expect(guestViewUrl(base, "shared", "tok")).toBe(
+      "https://termix.example/?view=shared&token=tok",
+    );
+  });
+
+  it("gives no link for a session on the desktop's own backend", async () => {
+    expect(
+      await sessionPublicUrl(desktop("https://termix.example/"), "local"),
+    ).toBeNull();
+    expect(
+      guestViewUrl("file:///C:/app/index.html", "shared", "tok"),
+    ).toBeNull();
+  });
+
+  it("uses the page address in a browser", async () => {
+    const app = { desktop: { available: false } } as unknown as TermixApp;
+    expect(await sessionPublicUrl(app, undefined)).toBe(window.location.href);
+  });
+});
diff --git a/plugins/ssh-terminal/src/frontend/terminal/Terminal.tsx b/plugins/ssh-terminal/src/frontend/terminal/Terminal.tsx
index fbc0e7613..4da80fecc 100644
--- a/plugins/ssh-terminal/src/frontend/terminal/Terminal.tsx
+++ b/plugins/ssh-terminal/src/frontend/terminal/Terminal.tsx
@@ -281,6 +281,7 @@ const TerminalInner = forwardRef<TerminalHandle, SSHTerminalProps>(
     const webSocketRef = useRef<WebSocket | null>(null);
     const terminalInputDisposableRef = useRef<{ dispose(): void } | null>(null);
     const localEchoRef = useRef<TerminalLocalEcho | null>(null);
+    const sessionOriginRef = useRef<"local" | "remote">("local");
     const customKeybindingsRef = useRef<CustomKeybinding[]>([]);
     const resizeTimeout = useRef<NodeJS.Timeout | null>(null);
     const wasDisconnectedBySSH = useRef(false);
@@ -785,6 +786,7 @@ const TerminalInner = forwardRef<TerminalHandle, SSHTerminalProps>(
                 sessionId: sessionIdRef.current,
                 protocol: "ssh" as const,
                 tabInstanceId: hostConfig.instanceId,
+                origin: sessionOriginRef.current,
               }
             : null,
       }),
@@ -1642,6 +1644,7 @@ const TerminalInner = forwardRef<TerminalHandle, SSHTerminalProps>(
                 "local" | "remote" | null | undefined,
             })
           : "local";
+        sessionOriginRef.current = origin === "remote" ? "remote" : "local";
         const resolvedUrl = await pluginWsUrl("ssh-terminal", "/terminal", {
           origin,
         });
diff --git a/plugins/ssh-terminal/src/frontend/terminal/terminal-slots.ts b/plugins/ssh-terminal/src/frontend/terminal/terminal-slots.ts
index a87d502be..f4653df96 100644
--- a/plugins/ssh-terminal/src/frontend/terminal/terminal-slots.ts
+++ b/plugins/ssh-terminal/src/frontend/terminal/terminal-slots.ts
@@ -38,6 +38,7 @@ export interface TerminalSlotApi {
     sessionId: string;
     protocol: "ssh";
     tabInstanceId?: string;
+    origin?: "local" | "remote";
   } | null;
 }