Broken pserver, RH 7.3

[Tisha Stacey]

After receiving the fairly recent security notices about the
double-free bug in pserver, I upgraded all our linux hosts to the
current CVS version (1.11.5).  As a result, anonymous check-out via
pserver no longer works for repositories located on RedHat 7.3
machines.  We also have linux machines running Mandrake 7.2, and
pserver to those mahines continues to work fine.

I tried back-revving one of the RH 7.3 machines to v. 1.11.1p1
(patched version downloaded from RedHat), but the results are the same
(can't use pserver).

Here's a transcript:

bravo:~/tmp > cvs -d :pserver:address@hidden:/sandbox/cvs
login
Logging in to :pserver:address@hidden:2401/sandbox/cvs
CVS password: 
bravo:~/tmp > cvs -d :pserver:address@hidden:/sandbox/cvs
co flog
Fatal error, aborting.
anonymous: no such user

pserver on bach *is* listening:

bravo:~/tmp > telnet bach.mcs.anl.gov 2401
Trying 140.221.10.12...
Connected to bach.mcs.anl.gov.
Escape character is '^]'.

cvs [pserver aborted]: bad auth protocol start: 

Connection closed by foreign host.

I've been mucking with this for a while now and have exhausted my own
resources.  Any help would be much appreciated.

- Tisha Stacey