diff --git a/ogc/core.py b/ogc/core.py
index 043d90d..6d1444e 100755
--- a/ogc/core.py
+++ b/ogc/core.py
@@ -86,10 +86,11 @@ def get_coverage_from_id(self, identifier):
         for coverage in self.wcs_capabilities.coverages:
             if coverage.identifier == identifier:
                 return coverage
+        logger.warning("OGC: get_coverage_from_id invalid identifier: %r", identifier)
         raise WCSException(
             exception_code="InvalidParameterValue",
             locator="COVERAGE",
-            exception_text="Invalid coverage {}".format(identifier),
+            exception_text="Invalid coverage identifier",
         )
 
     def get_capabilities_wcs(self, args):
@@ -172,10 +173,11 @@ def handle_wcs_kv(self, args):
             wcs_response = wcs_response_1_0_0
             wcs_request = wcs_request_1_0_0
         else:
+            logger.warning("OGC: handle_wcs_kv unsupported version: %r", args.get("version"))
             raise WCSException(
                 exception_code="InvalidParameterValue",
                 locator="VERSION",
-                exception_text="Unsupported version: %s" % (args["version"] if "version" in args else "None"),
+                exception_text="Unsupported version",
             )
 
         if args["request"] == "DescribeCoverage":
@@ -184,7 +186,8 @@ def handle_wcs_kv(self, args):
         elif args["request"] == "GetCoverage":
             return self.get_coverage_wcs(args, wcs_request)
 
-        raise WCSException(exception_text="KV Request not handled properly: " + str(args))
+        logger.warning("OGC: handle_wcs_kv unhandled request args: %r", args)
+        raise WCSException(exception_text=INVALID_ARGUMENTS)
 
     def get_capabilities_wms(self, args):
         get_capabilities = wms_request_1_3_0.GetCapabilities()
@@ -280,10 +283,11 @@ def handle_wms_kv(self, args):
         if "version" in args and args["version"] == "1.3.0":
             wms_request = wms_request_1_3_0
         else:
+            logger.warning("OGC: handle_wms_kv unsupported version: %r", args.get("version"))
             raise WCSException(
                 exception_code="InvalidParameterValue",
                 locator="VERSION",
-                exception_text="Unsupported version: %s" % (args["version"] if "version" in args else "None"),
+                exception_text="Unsupported version",
             )
 
         if args["request"].lower() == "getlegendgraphic":
@@ -292,7 +296,8 @@ def handle_wms_kv(self, args):
         if args["request"].lower() == "getmap":
             return self.get_map(args, wms_request)
 
-        raise WCSException(exception_text="KV Request not handled properly: " + str(args))
+        logger.warning("OGC: handle_wms_kv unhandled request args: %r", args)
+        raise WCSException(exception_text=INVALID_ARGUMENTS)
 
     def handle_wmts_kv(self, args: Dict[str, Any]) -> Dict[str, Any] | str:
         """Handle WMTS key value server requests if support is enabled.
diff --git a/ogc/wmts/wmts_routes.py b/ogc/wmts/wmts_routes.py
index 299d93a..6314c16 100644
--- a/ogc/wmts/wmts_routes.py
+++ b/ogc/wmts/wmts_routes.py
@@ -59,7 +59,8 @@ def handle_kv(self, args: Dict[str, Any]) -> Dict[str, Any] | str:
         if args["request"].lower() == "gettile":
             return self.get_tile(args)
 
-        raise WMTSException(exception_text="KV Request not handled properly: " + str(args))
+        logger.warning("OGC: handle_kv unhandled request args: %r", args)
+        raise WMTSException(exception_text=INVALID_ARGUMENTS)
 
     def get_coverage_from_id(self, identifier: str) -> Coverage:
         """Find the coverage for a given identifier.
@@ -82,10 +83,11 @@ def get_coverage_from_id(self, identifier: str) -> Coverage:
         for coverage in self.coverages:
             if coverage.identifier == identifier:
                 return coverage
+        logger.warning("OGC: get_coverage_from_id invalid identifier: %r", identifier)
         raise WMTSException(
             exception_code="InvalidParameterValue",
             locator="COVERAGE",
-            exception_text="Invalid coverage {}".format(identifier),
+            exception_text="Invalid coverage identifier",
         )
 
     def get_capabilities(self, args: Dict[str, Any]) -> str:
@@ -122,10 +124,11 @@ def get_capabilities(self, args: Dict[str, Any]) -> str:
                 service_group_title=self.service_group_title,
             )
         else:
+            logger.warning("OGC: get_capabilities unsupported version: %r", args.get("version"))
             raise WMTSException(
                 exception_code="InvalidParameterValue",
                 locator="VERSION",
-                exception_text="Unsupported version: %s" % (args["version"]),
+                exception_text="Unsupported version",
             )
 
         try:
@@ -162,10 +165,11 @@ def get_tile(self, args: Dict[str, Any]) -> Dict[str, Any]:
         if "version" in args and args["version"] == "1.0.0":
             get_tile = wmts_request_1_0_0.GetTile()
         else:
+            logger.warning("OGC: get_tile unsupported version: %r", args.get("version"))
             raise WMTSException(
                 exception_code="InvalidParameterValue",
                 locator="VERSION",
-                exception_text="Unsupported version: %s" % (args["version"] if "version" in args else "None"),
+                exception_text="Unsupported version",
             )
 
         try: