diff --git a/providers/openfeature-provider-ofrep/src/openfeature/contrib/provider/ofrep/__init__.py b/providers/openfeature-provider-ofrep/src/openfeature/contrib/provider/ofrep/__init__.py
index 69372e12..e660d341 100644
--- a/providers/openfeature-provider-ofrep/src/openfeature/contrib/provider/ofrep/__init__.py
+++ b/providers/openfeature-provider-ofrep/src/openfeature/contrib/provider/ofrep/__init__.py
@@ -42,6 +42,8 @@
     ],
 ]
 
+_HTTP_AUTH_ERRORS: dict[int, str] = {401: "unauthorized", 403: "forbidden"}
+
 
 class OFREPProvider(AbstractProvider):
     def __init__(
@@ -176,24 +178,19 @@ def _handle_error(self, exception: requests.RequestException) -> NoReturn:
         if response is None:
             raise GeneralError(str(exception)) from exception
 
-        if response.status_code == 429:
-            retry_after = response.headers.get("Retry-After")
-            self.retry_after = _parse_retry_after(retry_after)
-            raise GeneralError(
-                f"Rate limited, retry after: {retry_after}"
-            ) from exception
-
+        self._raise_for_http_status(response, exception)
+        # Fallthrough: parse JSON and raise based on error code
         try:
             data = response.json()
         except JSONDecodeError:
             raise ParseError(str(exception)) from exception
 
-        error_code = ErrorCode(data["errorCode"])
+        try:
+            error_code = ErrorCode(data["errorCode"])
+        except ValueError:
+            error_code = ErrorCode.GENERAL
         error_details = data["errorDetails"]
 
-        if response.status_code == 404:
-            raise FlagNotFoundError(error_details) from exception
-
         if error_code == ErrorCode.PARSE_ERROR:
             raise ParseError(error_details) from exception
         if error_code == ErrorCode.TARGETING_KEY_MISSING:
@@ -205,6 +202,32 @@ def _handle_error(self, exception: requests.RequestException) -> NoReturn:
 
         raise OpenFeatureError(error_code, error_details) from exception
 
+    def _raise_for_http_status(
+        self,
+        response: requests.Response,
+        exception: requests.RequestException,
+    ) -> None:
+        status = response.status_code
+
+        if status == 429:
+            retry_after = response.headers.get("Retry-After")
+            self.retry_after = _parse_retry_after(retry_after)
+            raise GeneralError(
+                f"Rate limited, retry after: {retry_after}"
+            ) from exception
+        elif status in _HTTP_AUTH_ERRORS:
+            raise OpenFeatureError(
+                ErrorCode.GENERAL, _HTTP_AUTH_ERRORS[status]
+            ) from exception
+        elif status == 404:
+            try:
+                error_details = response.json()["errorDetails"]
+            except (JSONDecodeError, KeyError):
+                error_details = response.text
+            raise FlagNotFoundError(error_details) from exception
+        elif status > 400:
+            raise OpenFeatureError(ErrorCode.GENERAL, response.text) from exception
+
 
 def _build_request_data(
     evaluation_context: Optional[EvaluationContext],
diff --git a/providers/openfeature-provider-ofrep/tests/test_provider.py b/providers/openfeature-provider-ofrep/tests/test_provider.py
index a84b369d..6709faf4 100644
--- a/providers/openfeature-provider-ofrep/tests/test_provider.py
+++ b/providers/openfeature-provider-ofrep/tests/test_provider.py
@@ -3,9 +3,11 @@
 from openfeature.contrib.provider.ofrep import OFREPProvider
 from openfeature.evaluation_context import EvaluationContext
 from openfeature.exception import (
+    ErrorCode,
     FlagNotFoundError,
     GeneralError,
     InvalidContextError,
+    OpenFeatureError,
     ParseError,
     TypeMismatchError,
 )
@@ -83,6 +85,61 @@ def test_provider_flag_not_found(ofrep_provider, requests_mock):
         ofrep_provider.resolve_boolean_details("flag_key", False)
 
 
+def test_provider_unauthorized(ofrep_provider, requests_mock):
+    requests_mock.post(
+        "http://localhost:8080/ofrep/v1/evaluate/flags/flag_key",
+        status_code=401,
+        text="unauthorized",
+    )
+
+    with pytest.raises(OpenFeatureError) as exc_info:
+        ofrep_provider.resolve_boolean_details("flag_key", False)
+
+    assert exc_info.value.error_code == ErrorCode.GENERAL
+    assert exc_info.value.error_message == "unauthorized"
+
+
+def test_provider_forbidden(ofrep_provider, requests_mock):
+    requests_mock.post(
+        "http://localhost:8080/ofrep/v1/evaluate/flags/flag_key",
+        status_code=403,
+        text="forbidden",
+    )
+
+    with pytest.raises(OpenFeatureError) as exc_info:
+        ofrep_provider.resolve_boolean_details("flag_key", False)
+
+    assert exc_info.value.error_code == ErrorCode.GENERAL
+    assert exc_info.value.error_message == "forbidden"
+
+
+def test_provider_flag_not_found_invalid_json(ofrep_provider, requests_mock):
+    """Test 404 with non-JSON response falls back to response text for error details"""
+    requests_mock.post(
+        "http://localhost:8080/ofrep/v1/evaluate/flags/flag_key",
+        status_code=404,
+        text="Flag not found - plain text response",
+    )
+
+    with pytest.raises(FlagNotFoundError, match="Flag not found - plain text response"):
+        ofrep_provider.resolve_boolean_details("flag_key", False)
+
+
+def test_provider_server_error(ofrep_provider, requests_mock):
+    """Test generic OpenFeatureError for status codes > 400 (e.g. 500, 502)"""
+    requests_mock.post(
+        "http://localhost:8080/ofrep/v1/evaluate/flags/flag_key",
+        status_code=500,
+        text="Internal Server Error",
+    )
+
+    with pytest.raises(OpenFeatureError) as exc_info:
+        ofrep_provider.resolve_boolean_details("flag_key", False)
+
+    assert exc_info.value.error_code == ErrorCode.GENERAL
+    assert exc_info.value.error_message == "Internal Server Error"
+
+
 def test_provider_invalid_context(ofrep_provider, requests_mock):
     requests_mock.post(
         "http://localhost:8080/ofrep/v1/evaluate/flags/flag_key",