I'm also missing a server greeting once in a while. A bit more often  
than 1 out of 5 as Hendrik Schumacer experiences with  
c303.cloudmark.net here:

http://sourceforge.net/mailarchive/forum.php?thread_name=23191d5c353f2dad5117334c94811cb7.squirrel%40www.activeframe.de&forum_name=razor-users

I'm using Razor2 2.84, SpamAssassin 3.2.5 and Perl 5.8.8

Here's some debugging output from a mailscan that goes haywire:

Dec 26 20:52:17.586908 check[71557]: [ 2] [bootup] Logging initiated
LogDebugLevel=5 to file:razor-agent.log
Dec 26 20:52:17.587441 check[71557]: [ 5] computed razorhome=, conf=,
ident=identity
Dec 26 20:52:17.588375 check[71557]: [ 5] Can't read file
/servers.discovery.lst: No such file or directory
Dec 26 20:52:17.588545 check[71557]: [ 5] Can't read file
/servers.nomination.lst: No such file or directory
Dec 26 20:52:17.588705 check[71557]: [ 5] Can't read file
/servers.catalogue.lst: No such file or directory
Dec 26 20:52:17.588901 check[71557]: [ 5] no listfile:  
servers.catalogue.lst
Dec 26 20:52:17.589107 check[71557]: [ 5] Connecting to
discovery.razor.cloudmark.com ...
Dec 26 20:52:17.785213 check[71557]: [ 4]  
discovery.razor.cloudmark.com >> 0
server greeting:
Dec 26 20:52:17.785362 check[71557]: [ 4]  
discovery.razor.cloudmark.com << 12
Dec 26 20:52:17.785597 check[71557]: [ 5] _read: connection_closed

And for informational purposes here's one that's ok, with exact same  
setup:

Dec 26 21:49:32.538759 check[83113]: [ 2] [bootup] Logging initiated
LogDebugLevel=5 to file:razor-agent.log
Dec 26 21:49:32.546787 check[83113]: [ 5] computed razorhome=, conf=,
ident=identity
Dec 26 21:49:32.547497 check[83113]: [ 5] Can't read file
/servers.discovery.lst: No such file or directory
Dec 26 21:49:32.547648 check[83113]: [ 5] Can't read file
/servers.nomination.lst: No such file or directory
Dec 26 21:49:32.547791 check[83113]: [ 5] Can't read file
/servers.catalogue.lst: No such file or directory
Dec 26 21:49:32.547971 check[83113]: [ 5] no listfile:  
servers.catalogue.lst
Dec 26 21:49:32.548159 check[83113]: [ 5] Connecting to
discovery.razor.cloudmark.com ...
Dec 26 21:49:33.199625 check[83113]: [ 4]  
discovery.razor.cloudmark.com >> 35
server greeting: sn=D&srl=570&a=1&a=cg&ep4=7542-10^M
Dec 26 21:49:33.199783 check[83113]: [ 4]  
discovery.razor.cloudmark.com << 12
Dec 26 21:49:33.295701 check[83113]: [ 4]  
discovery.razor.cloudmark.com >> 71
Dec 26 21:49:33.295903 check[83113]: [ 4]  
discovery.razor.cloudmark.com << 12
Dec 26 21:49:33.390551 check[83113]: [ 4]  
discovery.razor.cloudmark.com >> 91
Dec 26 21:49:33.390773 check[83113]: [ 5] disconnecting from server
discovery.razor.cloudmark.com
Dec 26 21:49:33.390869 check[83113]: [ 4]  
discovery.razor.cloudmark.com << 5
[...]

I've also posted this as a bug to the SpamAssassin guys, since this  
error in Razor in conjunction with a bad SIGPIPE handler in  
SpamAssassin has caused me to loose emails. The error that has been  
logged with SpamAssassin can be found here:

https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6033

But can someone look into why we are experiencing missing server  
greetings?

Thanks!

Best regards
Rasmus Skaarup