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In BMF v 6.1.0.0 a have in log many conduit errors like:

5 Feb 2010 11:22:25 (ERROR:7868.6136): [12034] Network error occurred, SSL: error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol (35), check your network connection settings, check your proxy settings (if applicable), and check to ensure that port 443 (HTTPS) is open through any relevant firewalls.

We have exchange 2003 on cluster, and I only renew our ssl certificates on IIS (OWA) 2 days ago.

What are this errors mean? Some people calling, that his mailbox are work slower. This errors can to affect on mailbox (exchange) performence? How to fix this errors?

This error means conduit had a temporary problem either downloading rules or reporting stats back to Symantec.  It does not affect message throughput.

Do you use a proxy?  (The error seems to indicate the Symantec server is not "talking" ssl, possibly caused by proxy behavior)
How often are the errors? (1 min, 15 min, 1 hour, etc apart)

We dont have proxy. These errors appears in minutes interval (few times per minutes). 

Can you include a a larger sampling of your log. It is possible these are just times when the Symantec web sever went down temporarily for maintenance.

Have you had a chance to verify that you can connect out to the correct location over port 443?  This could be a network related issue, i.e. a firewall blocking the connection to the Symantec Brightmail backend servers.

If you do a test from the command/shell line this may help you can try:

On the server, at the prompt type:

telnet aztec.brightmail.com 443

If you get any error message you can't connect  that means that something is blocking this servers ability to connect over port 443 to aztec.brightmail.com. 

Seeing a blank screen means that a connection was established.

Thanks, this errors disappear...we had problem with exchange. owa etc