[stunnel-users] Stunnel V4.05 error with rsync

Tue Oct 12 10:12:16 CEST 2004

On Oct 11, 2004, at 8:51 PM, craig hobbs wrote:

> I am getting a frequent error where my rsync client process just 
> appears to hang. On the client side I will receive several 'SSL_read 
> returned WANT_: retrying/SSL_write returned WANT_: retrying' messages 
> back-to-back

That's a normal part of the SSL protocol.  Nothing to worry about.

>  and then finally the message is always
> 'Socket closed on read'.

That means your rsync client or server has closed the connection.

> Currently in no-blocking mode with the following limits: 
> FD_SETSIZE=1024, file ulimit=2147483647 -> 500 clients allowed
>
> Is there any stunnel bug or system resource limit that could be the 
> problem ??

FD_SETSIZE is a limitation of select(2) function.  See the manual for 
details.
New stunnel 4.06 will be able to use poll(2) function instead.

> 2004.10.11 14:46:32 LOG7[26651:7]: SSL_write returned WANT_: retrying
> 2004.10.11 14:46:32 LOG7[26651:7]: SSL socket closed on SSL_read

This is strange.  Stunnel should not close the SSL connection without 
sending close_notify message first.

Best regards,
     Mike