NFS over TCP on v5r4?

hi,
I activated nfs service via STRNFSSVR *ALL on v5r4 in order to present a share of some IFS directories to remote linux machine.
Linux machine(ubuntu client) was not able to mount it. I also tried the same operation from vmware ESXi client which returns the following: "NFS Error: Unable to Mount filesystem: The NFS server does not support MOUNT version 3 over TCP."
doing rpcinfo -p as400.local.com gives:
program vers proto port
100000 3 udp 111 portmapper
100000 2 udp 111 portmapper
100000 3 tcp 111 portmapper
100000 2 tcp 111 portmapper
100003 2 udp 2049 nfs
100003 3 udp 2049 nfs
100005 1 udp 57063 mountd
100005 3 udp 60135 mountd
100024 1 udp 60101 status
100024 1 tcp 13221 status
100021 1 udp 27447 nlockmgr
100021 1 tcp 34928 nlockmgr
100021 3 udp 13310 nlockmgr
100021 3 tcp 40688 nlockmgr
100021 4 udp 18111 nlockmgr
100021 4 tcp 50195 nlockmgr
100021 2 udp 13214 nlockmgr
100021 2 tcp 52844 nlockmgr
100020 3 tcp 13347 llockmgr
100020 3 udp 50079 llockmgr



back to v5r4 machine, netstat *cnn gives no tcp port 2049!

* * 21 000:00:00 In ascolto
* * telnet 000:00:01 In ascolto
* * 25 000:00:00 In ascolto
* * www 000:00:38 In ascolto
* * 89 017:57:12 In ascolto
* * pop3 000:00:01 In ascolto
* * 111 010:22:52 In ascolto
* * 111 010:22:33 *UDP
* * 123 +++++++++ *UDP

* * 2034 +++++++++ In ascolto
* * 2049 010:22:20 *UDP
* * 2301 +++++++++ In ascolto

..There is no nfs over tcp!

Is nfs over tcp supported in v5r4 ?


thanks
dino muzic