Starting second network fails

Hi,

A network is started. When second network (different NET-WORK-ID) is started it fails showing this output message:

f80s3 (sag)_ startnet.bsh f80s3 (sag)_ %NETRDI-I-STARTED, 24-OCT-2017 14:56:12, Version 2.1.1.23, (A
IX43)
%NETRDI-F-GDTLOCKF, Can’t lock GDT, NET-WORK already active or ADABAS failure
%NETRDI-F-NETFAIL, NET-WORK start failed
%NETRDI-I-TERMINATED, 24-OCT-2017 14:56:15, elapsed time: 00:00:03

What are we missing?

Many thanks in advance!

Our environment runs on AIX4.3.3:

AIX 4.3.3
Adabas 311 pl 43
Natural 412 pl 15
Natural Security 412 pl 15
Predict 412 pl 2
Entire Net-Work v211 /23
Entire X Broker v531 /4