Log errors in client certificate auth

I found this error in my ssl_engine.log when I access to apache+modssl site
with client certificate authentication.
what does it mean by this error and how do I fix this?

Actually I dont have problems in accessing it but some of our users
encountered page cannot be displayed.

----------------snip------------------
[30/Sep/2002 11:36:56 20984] [trace] OpenSSL: Exit: failed in SSLv3 read
client certificate A
[30/Sep/2002 11:36:56 20984] [error] Re-negotiation handshake failed: Not
accepted by client!?
[30/Sep/2002 11:36:56 20984] [debug] OpenSSL: read 0/34821 bytes from
BIO#08217818 [mem: 082C6BE8] (BIO dump follows)
+----------------------------------------------------------- --------------+
+----------------------------------------------------------- --------------+
[30/Sep/2002 11:36:56 20984] [trace] OpenSSL: Exit: failed in SSLv3 read
client certificate A
[30/Sep/2002 11:36:56 20984] [error] SSL error on writing data (OpenSSL
library error follows)
[30/Sep/2002 11:36:56 20984] [error] OpenSSL: error:1409E0E5:SSL
routines:SSL3_WRITE_BYTES:ssl handshake failure
[30/Sep/2002 11:36:56 20984] [info] Connection to child 5 closed with
unclean shutdown (server mail.server.com:443, client 192.168.1.1)
-----------------snip-----------------

TIA
--- Glynn ---



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