https://m204wiki.rocketsoftware.com/index.php?action=history&feed=atom&title=IBM_z%2FOS_2.1_compatibility_issue 2026-04-27T16:43:57Z Revision history for this page on the wiki MediaWiki 1.43.1 https://m204wiki.rocketsoftware.com/index.php?title=IBM_z/OS_2.1_compatibility_issue&diff=74687&oldid=prev 2015-01-22T22:49:54Z

<p>Created page with &quot;In Model 204 versions 7.5 and lower, Horizon TCP applications sending data larger than 16K might get the following error: &lt;p class=&quot;code&quot;&gt;M204.1254: User language statemen...&quot;</p> <p><b>New page</b></p><div>In Model 204 versions 7.5 and lower, Horizon TCP applications sending data larger than 16K might get the following error: <br /> &lt;p class=&quot;code&quot;&gt;M204.1254: User language statement is invalid in this conversation state&lt;/p&gt; <br /> This error occurs under z/OS version 2.1 because the TCP Default Send Buffer Size (DefaultSndBufSize) was increased to 65536 (from 16384 in earlier versions).<br /> <br /> The solutions are as follows:<br /> &lt;ul&gt;<br /> &lt;li&gt;&lt;b&gt;Model 204 v7.5:&lt;/b&gt; &lt;br /&gt;Apply zap 75Z226.&lt;/li&gt;<br /> &lt;li&gt;&lt;b&gt;Model 204 v7.4:&lt;/b&gt; &lt;br /&gt;Currently fixed by zap 74Z4552. Contact [[Contacting Rocket Software Technical Support|Technical Support]].&lt;/li&gt;<br /> &lt;li&gt;&lt;b&gt;Model 204 v7.1 (and lower):&lt;/b&gt; &lt;br /&gt;Workaround: Set z/OS 2.1 TCP DefaultSndBufSize to 16384.&lt;/li&gt;<br /> &lt;/ul&gt;</div>

ELowell