diff --git a/app/platforms/implementations/openeo.py b/app/platforms/implementations/openeo.py
index 0a77dfd..44d7972 100644
--- a/app/platforms/implementations/openeo.py
+++ b/app/platforms/implementations/openeo.py
@@ -9,7 +9,7 @@
 from loguru import logger
 from stac_pydantic import Collection
 
-from app.auth import exchange_token
+from app.auth import exchange_token, get_current_user_id
 from app.config.schemas import AuthMethod
 from app.config.settings import settings
 from app.error import AuthException
@@ -104,16 +104,17 @@ async def _setup_connection(self, user_token: str, url: str) -> openeo.Connectio
         Setup the connection to the OpenEO backend.
         This method can be used to initialize any required client or session.
         """
-        if url in self._connection_cache and not self._connection_expired(
-            self._connection_cache[url]
+        cache_key = "openeo_connection_" + get_current_user_id(user_token) + "_" + url
+        if cache_key in self._connection_cache and not self._connection_expired(
+            self._connection_cache[cache_key]
         ):
-            logger.debug(f"Reusing cached OpenEO connection to {url}")
-            return self._connection_cache[url]
+            logger.debug(f"Reusing cached OpenEO connection to {url} (key: {cache_key})")
+            return self._connection_cache[cache_key]
 
         logger.debug(f"Setting up OpenEO connection to {url}")
         connection = openeo.connect(url)
         connection = await self._authenticate_user(user_token, url, connection)
-        self._connection_cache[url] = connection
+        self._connection_cache[cache_key] = connection
         return connection
 
     def _get_client_credentials(self, url: str) -> tuple[str, str, str]:
diff --git a/tests/platforms/test_openeo_platform.py b/tests/platforms/test_openeo_platform.py
index fa51a36..e196524 100644
--- a/tests/platforms/test_openeo_platform.py
+++ b/tests/platforms/test_openeo_platform.py
@@ -474,11 +474,15 @@ async def test_authenticate_user_config_format_issue_credentials(
 @pytest.mark.asyncio
 @patch("app.platforms.implementations.openeo.openeo.connect")
 @patch.object(OpenEOPlatform, "_authenticate_user", new_callable=AsyncMock)
-async def test_setup_connection_creates_and_caches(mock_auth, mock_connect, platform):
+@patch("app.platforms.implementations.openeo.get_current_user_id")
+async def test_setup_connection_creates_and_caches(
+    mock_current_user_id, mock_auth, mock_connect, platform
+):
     platform._connection_cache = {}
     mock_conn = MagicMock()
     mock_connect.return_value = mock_conn
     mock_auth.return_value = mock_conn
+    mock_current_user_id.return_value = "user123"
 
     url = "https://example.backend"
     conn = await platform._setup_connection("user-token", url)
@@ -486,20 +490,24 @@ async def test_setup_connection_creates_and_caches(mock_auth, mock_connect, plat
     mock_connect.assert_called_once_with(url)
     mock_auth.assert_awaited_once_with("user-token", url, mock_conn)
     assert conn is mock_conn
-    assert platform._connection_cache[url] is mock_conn
+    cache_key = "openeo_connection_" + mock_current_user_id.return_value + "_" + url
+    assert platform._connection_cache[cache_key] is mock_conn
 
 
+@pytest.mark.asyncio
 @patch.object(OpenEOPlatform, "_connection_expired", return_value=False)
 @patch("app.platforms.implementations.openeo.openeo.connect")
 @patch.object(OpenEOPlatform, "_authenticate_user", new_callable=AsyncMock)
-@pytest.mark.asyncio
+@patch("app.platforms.implementations.openeo.get_current_user_id")
 async def test_setup_connection_uses_cache_if_not_expired(
-    mock_auth, mock_connect, mock_expired, platform
+    mock_current_user_id, mock_auth, mock_connect, mock_expired, platform
 ):
+    mock_current_user_id.return_value = "user123"
     platform._connection_cache = {}
     url = "https://example.backend"
     cached_conn = MagicMock()
-    platform._connection_cache[url] = cached_conn
+    cache_key = "openeo_connection_" + mock_current_user_id.return_value + "_" + url
+    platform._connection_cache[cache_key] = cached_conn
 
     conn = await platform._setup_connection("user-token", url)
 
@@ -510,18 +518,21 @@ async def test_setup_connection_uses_cache_if_not_expired(
     mock_auth.assert_not_awaited()
 
 
+@pytest.mark.asyncio
 @patch.object(OpenEOPlatform, "_connection_expired", return_value=True)
 @patch("app.platforms.implementations.openeo.openeo.connect")
 @patch.object(OpenEOPlatform, "_authenticate_user", new_callable=AsyncMock)
-@pytest.mark.asyncio
+@patch("app.platforms.implementations.openeo.get_current_user_id")
 async def test_setup_connection_recreates_if_expired(
-    mock_auth, mock_connect, mock_expired, platform
+    mock_current_user_id, mock_auth, mock_connect, mock_expired, platform
 ):
+    mock_current_user_id.return_value = "user123"
     platform._connection_cache = {}
     url = "https://example.backend"
     old_conn = MagicMock()
     new_conn = MagicMock()
-    platform._connection_cache[url] = old_conn
+    cache_key = "openeo_connection_" + mock_current_user_id.return_value + "_" + url
+    platform._connection_cache[cache_key] = old_conn
 
     mock_connect.return_value = new_conn
     mock_auth.return_value = new_conn
@@ -531,15 +542,17 @@ async def test_setup_connection_recreates_if_expired(
     mock_connect.assert_called_once_with(url)
     mock_auth.assert_awaited_once_with("user-token", url, new_conn)
     assert conn is new_conn
-    assert platform._connection_cache[url] is new_conn
+    assert platform._connection_cache[cache_key] is new_conn
 
 
+@pytest.mark.asyncio
 @patch("app.platforms.implementations.openeo.openeo.connect")
 @patch.object(OpenEOPlatform, "_authenticate_user", new_callable=AsyncMock)
-@pytest.mark.asyncio
+@patch("app.platforms.implementations.openeo.get_current_user_id")
 async def test_setup_connection_propagates_auth_error(
-    mock_auth, mock_connect, platform
+    mock_current_user_id, mock_auth, mock_connect, platform
 ):
+    mock_current_user_id.return_value = "user123"
     platform._connection_cache = {}
     url = "https://example.backend"
     mock_conn = MagicMock()
@@ -550,7 +563,8 @@ async def test_setup_connection_propagates_auth_error(
         await platform._setup_connection("user-token", url)
 
     # authenticate failed, connection must not be cached
-    assert url not in platform._connection_cache
+    cache_key = "openeo_connection_" + mock_current_user_id.return_value + "_" + url
+    assert cache_key not in platform._connection_cache
 
 
 @pytest.mark.asyncio