ssh_exchange_identification: Connection closed by remote host

[chkbrian]

Hello,

I encountered the following problem while I typing "ssh -v <host_name>"

"
hkmarmmspd:/export/home/hkcheung> ssh -v hkmauat
OpenSSH_3.6.1p1, SSH protocols 1.5/2.0, OpenSSL 0x0090701f
debug1: Reading configuration data /usr/local/etc/ssh_config
debug1: Rhosts Authentication disabled, originating port will not be trusted.
debug1: Connecting to hkmauat [172.28.68.52] port 22.
debug1: Connection established.
debug1: identity file /export/home/hkcheung/.ssh/identity type -1
debug1: identity file /export/home/hkcheung/.ssh/id_rsa type -1
debug1: identity file /export/home/hkcheung/.ssh/id_dsa type -1
ssh_exchange_identification: Connection closed by remote host
debug1: Calling cleanup 0x2c95c(0x0)
hkmarmmspd:/export/home/hkcheung> 

".

Strangly, sometime the problem is not occurred.

Can someone give me some advices.

Thanks!