My comment seems to be of a reasonable size. I don't understand why the server is complaining!

projId=15301e67103a3795d91db262dbc69d00b3711e3d6848763c, messageId=15301e67103a379524883892d9757acf6755b1c1035e80e0,

combody=<pre>Subject changed from 'test form msg' to 'test form msG'</pre>

https://projects.zoho.com/portal/yoxel/api/private/xml/message/addcomment?apikey=...&ticket=... : HTTP/1.1 500 Internal Server Error

<?xml version="1.0" encoding="UTF-8" ?>

<response uri="/jsp/error.jsp"><error><code>6831</code><message>Input Parameter Exceeds Maximum Length</message></error></response>