The Problem is with Sybase's "Jaguar CTS component transaction server".
On our application we use it to store session data between serveral web-servers. It's running a simple java-application.

Yesterday i upgraded to 4.2.1 on a test Server. Everything worked fine on 4.1.2.

Code example:
$server = sybase_connect(SERVER,USER,PASS);
sybase_query("exec PhpSession.Manager_de.setSessionData '0146119b4fb52b5e408243a37c118720cb','TEST'",$server);
$query  = sybase_query("exec PhpSession.Manager_de.getSessionData '0146119b4fb52b5e408243a37c118720cb'",$server);
if(!$query)     echo "QUERY FAILED";

You see that our Application is very easy: Just set or get Session-Data. This Code Sample works on all Live-Servers and on the Test Server running 4.1.2. I tried both: connect and pconnect, but 4.2.1 doesn't work. It even doesn't matter which Query i use, they all fail, without Error-Message.

Furthermore, the normal sybase DB-Connections are working without Problems on 4.2.1. It's just this Application-Server connection which fails.

I use the Sybase client 11.9.2 and Apache 1.3.24 (I tried 1.3.23, too).

Thx ...