Multisite 'Add New Site' Trigger Error

When I tried to create a new site after reconfiguring my local installation of WP as a multisite setup, I got this error message:

Add New Site

Warning: An unexpected error occurred. Something may be wrong with ww.wp.xz.cn or this server’s configuration. If you continue to have problems, please try the support forums. (WordPress could not establish a secure connection to ww.wp.xz.cn. Please contact your server administrator.) in /srv/www/wordpress-default/wp-admin/includes/translation-install.php on line 59

Line 59 of www/wordpress-default/wp-admin/includes/translation-install.php starts with “trigger_error” below:

if ( $ssl && is_wp_error( $request ) ) {
			trigger_error( __( 'An unexpected error occurred. Something may be wrong with ww.wp.xz.cn or this server’s configuration. If you continue to have problems, please try the <a href="https://ww.wp.xz.cn/support/">support forums</a>.' ) . ' ' . __( '(WordPress could not establish a secure connection to ww.wp.xz.cn. Please contact your server administrator.)' ), headers_sent() || WP_DEBUG ? E_USER_WARNING : E_USER_NOTICE );

			$request = wp_remote_post( $http_url, $options );
		}

Please advise.