Linux and DB2

Hello all!

Does anybody use DB2Connect on United Linux 1.0 We have the following 
Problem:

The DB2Connect Software enables access from DB2 Clients (e.g. for 
connecting Application Servers to Databases) to
to DB2 Databases on Z/oS Systems. You can say that DB2Connect works as a 
gateway.

At the moment we can't open more then 1100 parallel connections per 
DB2Connect installation. But doing the same on AIX 4000 - 5000 
connections are possible at the same time.
At the moment, suing United Linux 1.0 reach 1100 Connections then the 
whole machine hangs and must be rebooted. We don't achieve the CPU and 
RAM limits.

Are there e.g. any kernel parameters that limit the number of parallel 
calls to a Server ?? We are using kernel 2.4.21!
First of all, we get a sempahore error, but after changing the values in 
sysctl.conf, the were no further errors.

Is it possible, that Linux can't handle more then 1000 parallel 
connections? I don't hope so.

Thanks for answering!