external ldap: show proper error message on timeout

src/routes/externalldap.js

@@ -40,6 +40,8 @@ async function setConfig(req, res, next) {
     if ('bindDn' in req.body && typeof req.body.bindDn !== 'string') return next(new HttpError(400, 'bindDn must be a non empty string'));
     if ('bindPassword' in req.body && typeof req.body.bindPassword !== 'string') return next(new HttpError(400, 'bindPassword must be a string'));
 
+    req.clearTimeout(); // remove ldap server can take a bit to respond
+
     const [error] = await safe(externalLdap.setConfig(req.body, AuditSource.fromRequest(req)));
     if (error) return next(BoxError.toHttpError(error));