diff --git a/dirmngr/ks-engine-hkp.c b/dirmngr/ks-engine-hkp.c
index 0a86b5db7..bd98eed2d 100644
--- a/dirmngr/ks-engine-hkp.c
+++ b/dirmngr/ks-engine-hkp.c
@@ -1075,6 +1075,8 @@ handle_send_request_error (gpg_error_t err, const char *request,
     {
     case GPG_ERR_ECONNREFUSED:
     case GPG_ERR_ENETUNREACH:
+    case GPG_ERR_UNKNOWN_HOST:
+    case GPG_ERR_NETWORK:
       if (mark_host_dead (request) && *tries_left)
         retry = 1;
       break;