diff --git a/casadm/cas_main.c b/casadm/cas_main.c
index f41fb5a..1e361bd 100644
--- a/casadm/cas_main.c
+++ b/casadm/cas_main.c
@@ -2237,7 +2237,7 @@ static cli_command cas_commands[] = {
 			.options = attach_cache_options,
 			.command_handle_opts = start_cache_command_handle_option,
 			.handle = handle_cache_attach,
-			.flags = CLI_SU_REQUIRED,
+			.flags = (CLI_SU_REQUIRED | CLI_COMMAND_BLOCKED),
 			.help = NULL,
 		},
 		{
@@ -2247,7 +2247,7 @@ static cli_command cas_commands[] = {
 			.options = detach_options,
 			.command_handle_opts = command_handle_option,
 			.handle = handle_cache_detach,
-			.flags = CLI_SU_REQUIRED,
+			.flags = (CLI_SU_REQUIRED | CLI_COMMAND_BLOCKED),
 			.help = NULL,
 		},
 		{
diff --git a/modules/cas_cache/service_ui_ioctl.c b/modules/cas_cache/service_ui_ioctl.c
index 6f22d5f..567decc 100644
--- a/modules/cas_cache/service_ui_ioctl.c
+++ b/modules/cas_cache/service_ui_ioctl.c
@@ -86,6 +86,10 @@ long cas_service_ioctl_ctrl(struct file *filp, unsigned int cmd,
 
 		GET_CMD_INFO(cmd_info, arg);
 
+		printk(KERN_ERR "Cache attach is not supported!\n");
+		retval = -ENOTSUP;
+		RETURN_CMD_RESULT(cmd_info, arg, retval);
+
 		cache_name_from_id(cache_name, cmd_info->cache_id);
 
 		retval = cache_mngt_attach_cache_cfg(cache_name, OCF_CACHE_NAME_SIZE,
@@ -104,6 +108,9 @@ long cas_service_ioctl_ctrl(struct file *filp, unsigned int cmd,
 		char cache_name[OCF_CACHE_NAME_SIZE];
 
 		GET_CMD_INFO(cmd_info, arg);
+		printk(KERN_ERR "Cache detach is not supported!\n");
+		retval = -ENOTSUP;
+		RETURN_CMD_RESULT(cmd_info, arg, retval);
 
 		cache_name_from_id(cache_name, cmd_info->cache_id);