Title: Error: DOMDocument::loadXML(): Empty string supplied as input in Last modified: September 23, 2016 --- # Error: DOMDocument::loadXML(): Empty string supplied as input in * Resolved [KL](https://wordpress.org/support/users/karenecreativeca/) * (@karenecreativeca) * [9 years, 8 months ago](https://wordpress.org/support/topic/error-domdocumentloadxml-empty-string-supplied-as-input-in/) * Hi There, * I’m trying to connect to a CAS server, and get the following error: * DOMDocument::loadXML(): Empty string supplied as input in …/plugins/wp-cassify/ classes/wp_cassify_plugin.php on line 833 * I am getting a ticket response in the URL: * ?ticket=[ST-1516-EqypmPkPVdJshwxVWHea-cas-url] * but no XML content to parse. Am i missing some settings? or is this usually from the server I’m trying to authenticate to? Viewing 8 replies - 1 through 8 (of 8 total) * Plugin Author [Alain-Aymerick FRANCOIS](https://wordpress.org/support/users/aaf017/) * (@aaf017) * [9 years, 8 months ago](https://wordpress.org/support/topic/error-domdocumentloadxml-empty-string-supplied-as-input-in/#post-8215467) * Hi, * What’s version of CAS protocol used by your CAS server ? (CAS protocol version 2 or 3) Turn CAS protocol version to 2 and test again. * Test if you’ve not network or dns resolution problem between CAS Server and your WordPress server. * Have you try to enable debug feature in plugin admin panel? So, you can dump last response send by CAS server and see if XML response is well-formed. * See this topic: [[Resolved] DOM Document : load XML() empty string](https://wordpress.org/support/topic/dom-document-load-xml-empty-string/) * Best regards. * Thread Starter [KL](https://wordpress.org/support/users/karenecreativeca/) * (@karenecreativeca) * [9 years, 8 months ago](https://wordpress.org/support/topic/error-domdocumentloadxml-empty-string-supplied-as-input-in/#post-8215583) * Hi! * I was using CAS 3.0 with an empty string instead of a valid XML response (I’m told the server is 3.5) If I change my settings in wp-cassify to 2.0 I get the following back: * ``` ticket 'ST-45-5S5VCyYBIfm2hxwC3B9a-cas-server-url' does not match supplied service. The original service was 'https://client.com/sub' and the supplied service was 'https://client.com/sub/'. ``` * Incidentally, this worked ONE time, and one time only where I got a valid response back. * Thanks!! * Plugin Author [Alain-Aymerick FRANCOIS](https://wordpress.org/support/users/aaf017/) * (@aaf017) * [9 years, 8 months ago](https://wordpress.org/support/topic/error-domdocumentloadxml-empty-string-supplied-as-input-in/#post-8216470) * Hi, * Are you in multisite configuration or single worpdress install ? OK, in your browser type : [https://client.com/sub/](https://client.com/sub/). And test again. * Best regards. * Thread Starter [KL](https://wordpress.org/support/users/karenecreativeca/) * (@karenecreativeca) * [9 years, 8 months ago](https://wordpress.org/support/topic/error-domdocumentloadxml-empty-string-supplied-as-input-in/#post-8221480) * Hi Alain, * It’s a single wordpress install. * Today: * 1. First time I tried to login, success! 2. Tried to logout using: action=logout. php 3. Deleted the CAS user from wordpress users via an admin account (Users: delete user) 3. Tried to login: failed (see above) but it created a new userID anyway 4. Tried to login again, and was taken to the WordPress login screen, not the SSO login screen. I used my CAS credentials and it authenticated me and gave me this on the home page: * [Screenshot to Home Page](https://cl.ly/0u3m111w3d1o) * So. Is logging out an issue? and should I not be using WP logout? I think we’re close here, it’s just being a bit patchy. * Thanks so much for your assistance. I appreciate it. * Here is the success code: * ``` [myuserid] [myuserid] ``` - This reply was modified 9 years, 8 months ago by [KL](https://wordpress.org/support/users/karenecreativeca/). - This reply was modified 9 years, 8 months ago by [KL](https://wordpress.org/support/users/karenecreativeca/). Reason: **link to screenshot - This reply was modified 9 years, 8 months ago by [KL](https://wordpress.org/support/users/karenecreativeca/). * Plugin Author [Alain-Aymerick FRANCOIS](https://wordpress.org/support/users/aaf017/) * (@aaf017) * [9 years, 8 months ago](https://wordpress.org/support/topic/error-domdocumentloadxml-empty-string-supplied-as-input-in/#post-8223466) * Hi, * I can’t reproduce the bug because i’ve not single install only WP Multi-sites in prod. * But i think, it may be a bug in WP Single install. In single install, sometimes, there is a bug to calculate serviceUrl (callback url when you’re authenticated by CAS). * So i think, it works when you’re using [https://client.com/sub/](https://client.com/sub/) url but fails with the same url without slash [https://client.com/sub](https://client.com/sub). * Best regards. * Thread Starter [KL](https://wordpress.org/support/users/karenecreativeca/) * (@karenecreativeca) * [9 years, 8 months ago](https://wordpress.org/support/topic/error-domdocumentloadxml-empty-string-supplied-as-input-in/#post-8226361) * Ok. I’ll apply the trailingslashit() method to all of my login calls and let you know if that provides some consistency. * Thread Starter [KL](https://wordpress.org/support/users/karenecreativeca/) * (@karenecreativeca) * [9 years, 7 months ago](https://wordpress.org/support/topic/error-domdocumentloadxml-empty-string-supplied-as-input-in/#post-8260515) * Thanks for your time and help Alain. Ultimately, I had to go another way: creating a custom plugin based on phpCAS, with some inspiration (but no copying) from wp-cassify. In the end, I can have front-end users using SSO and still having wp-admin accessible to site administrators, so it works out for the best anyway. * Plugin Author [Alain-Aymerick FRANCOIS](https://wordpress.org/support/users/aaf017/) * (@aaf017) * [9 years, 6 months ago](https://wordpress.org/support/topic/error-domdocumentloadxml-empty-string-supplied-as-input-in/#post-8380244) * Okay, * I think that’s an incompatibility due to your WordPress install but i don’t know what. If you’ve found a workarround, i close ticket. * Best regards. Viewing 8 replies - 1 through 8 (of 8 total) The topic ‘Error: DOMDocument::loadXML(): Empty string supplied as input in’ is closed to new replies. * ![](https://ps.w.org/wp-cassify/assets/icon-256x256.png?rev=3112582) * [WP Cassify](https://wordpress.org/plugins/wp-cassify/) * [Frequently Asked Questions](https://wordpress.org/plugins/wp-cassify/#faq) * [Support Threads](https://wordpress.org/support/plugin/wp-cassify/) * [Active Topics](https://wordpress.org/support/plugin/wp-cassify/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/wp-cassify/unresolved/) * [Reviews](https://wordpress.org/support/plugin/wp-cassify/reviews/) ## Tags * [cas](https://wordpress.org/support/topic-tag/cas/) * [connection](https://wordpress.org/support/topic-tag/connection/) * 8 replies * 2 participants * Last reply from: [Alain-Aymerick FRANCOIS](https://wordpress.org/support/users/aaf017/) * Last activity: [9 years, 6 months ago](https://wordpress.org/support/topic/error-domdocumentloadxml-empty-string-supplied-as-input-in/#post-8380244) * Status: resolved