IDS 11.10.xC2 on Solaris 10

I'm looking for any ideas here as we seem to be getting the usual round-around from both Informix and Sun... We have an multi-database installation of IDS 10.0.UC4 on Solaris 9 (Sun fire v480) which we are replacing with a reloaded engine IDS 11.10.FC2 on Solaris 10 (Sun fire v490). The Solaris 10 + IDS 11 system runs really well (50%+ speed improvement) until after a couple of days we start seeing:- 05:49:39 listener-thread: err = -25575: oserr = 12: errstr = : Network driver cannot allocate the call structure. System error = 12. The operating system has been configured in accordance with the Machine Notes for the IDS 11.10.FC2 distribution - curiously there is no mention of tuning the TCP stack through ndd. Unfortunately the IBM (Informix) response has been a flat 'its an os error - speak to Sun' which is correct, but they wont help with any clues on what the call that is failing possibly is.... Sun are asking for source code and/or a truss of the failing process. I have tried setting the following prior to IDS startup:- ndd -set /dev/tcp tcp_time_wait_interval 15000 ndd -set /dev/tcp tcp_conn_req_max_q 4096 ndd -set /dev/tcp tcp_conn_req_max_q0 16384 ndd -set /dev/tcp tcp_max_buf 655350 ndd -set /dev/tcp tcp_cwnd_max 655350 Following my gut instinct for dealing with networking issues that *appear* to be with the queue depth However, I'd love to hear from someone who has any solid ideas or experience with this version mix.... Regards, Nick