When opening an LADP server form, errors are shown in the browser console:

[00:00:00.343] *** WARNING *** GlideAjax.getXMLWait - synchronous function - processor: GlideSystemAjax
js_includes_doctype.jsx?v=02-04-2016_1909&lp=Thu_Apr_07_06_33_39_PDT_2016&c=2_42:10510 *** WARNING *** GlideAjax.getXMLWait - synchronous function - processor: GlideSystemAjax
js_includes_navpage15.jsx?v=02-04-2016_1909&lp=Thu_Apr_07_06_33_39_PDT_2016&c=2_42:1922 [00:00:00.314] *** WARNING *** GlideAjax.getXMLWait - synchronous function - processor: SysMeta
js_includes_doctype.jsx?v=02-04-2016_1909&lp=Thu_Apr_07_06_33_39_PDT_2016&c=2_42:10510 *** WARNING *** GlideAjax.getXMLWait - synchronous function - processor: SysMeta

1. Navigate to System LDAP > LDAP Server.
2. In Chrome (or any other browser), open the browser console.
3. Open an LDAP server. 
4. View the error messages in the browser console.
   
   

This is expected behaviour and by design. The warning messages generated are not blocking and do not affect any functionality.