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[ale] openssh server returns FIN immediately after the TCP handshake

Starting today, I couldn't ssh into a production server, a stock
installation of RHEL 5.1/PPC (a LPAR on a 16-way power5 server). tcpdump
showed FIN packet was received on the client, immediately after the TCP
handshake (SYN + SYN ACK + ACK) was done.
The server functions otherwise (nfsd & syslogd).
If it matters, all os access accounts are controlled by a remote LDAP
server.  Same accounts can be used to authenticate the user successfully on
other RHEL 5.1/ppc against this LDAP server
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