apache 2.0.54, unexpected change cipher

Hi,

I'm using mod_ssl with apache 2.0.54-5, on a Debian Sarge.

My trouble is that Firefox sometimes returns an error 12237 which means 
SSL_ERROR_RX_UNEXPECTED_CHANGE_CIPHER "SSL received an unexpected Change 
Cipher Spec record.

It happens with Firefox 1.0.7 on Linux and Firefox 1.5 on Windows.

On my server, I'm using a valide certificate without any client 
verification.

I used a session cache like this:
SSLSessionCache        shmht:/var/run/apache2/ssl_scache(512000)
SSLSessionCacheTimeout  300
But after disabling it with "SSLSessionCache none" and reloading the 
server the problem is still here.

I've set LogLevel to warn, but there isn't any message in my logs.

I just migrate from apache-1.3, and there wasn't any problem with 1.3, 
so I think it's not a Firefox issue.

I'm using keepalive connection like this:
KeepAlive On
MaxKeepAliveRequests 100
KeepAliveTimeout 15

It seems happend when I reload a page with a basic authentication, but 
I'm not really sure because I always has a lot of open tabs, some with 
an authentication and other without.

Could you give me some tricks to resolve this ?
Thanks.

Regards,
Jean-François
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