How many TCP connections are wating to establish a connection to AIX Server

no -o somaxconn=1024
is very likely to adjust for slow service

There is no way (lsof, netstat, fuser) to determine connect queue length used on AIX)
Basically if you encounter missed connections on client side rule of a thumb is to increase connect queue.

next is looking at netstat -an for huge send or receive queues for some service.
Apache ( or IBM HTTP Server ) "reverse proxy" offloads websphere HTTP service very well

Ask if you need more help with that.

hi ghest,

  thanks for your prompt responce.

my question is , when we can get tcp/ip established connections with netstat -an | grep ESTABLISHED is there a way we can get tcp/ip waiting connections. sorry if i am asking same question again.

   Thanks in advance....:-)

There is no way.
You can consider WebSphere slow if netstat -an shows huge buffers waiting for it. That would lead to guess that it is slow at serving connections too thus needing greater help from operating system for SOMAXCONN.

Basically AIX accepts TCP connection and puts it into queue sized as determined by parameter somaxconn, then service calls accept() and serves connection.

hi ghest,

  yep , AIX accepts TCP connection and puts it into queue but is there anyway we can get that queue info like ..how many TCP connetions have been waiting in the queue..Thank in advance...

  thanks for your time and patience...........

In normal system when you see overloading service /like websphere with full receive buffers/ you add connection queue, so that nothing is missed.