Missing SID information on Snort site

[MA Bel <mab_generic () outlook com>]

Hi,
The following rule was triggered by Snort. The corresponding SID number is 20437. I did a search on the Snort website, 
no results were returned. This happens from time to time with other SIDs.   Does anyone know why the information is 
missing from the Snort website?
alert tcp $EXTERNAL_NET any -> $HOME_NET [443,465,587,995,993] (msg:"MALWARE-TOOLS multiple TLSv1 Encrypted Handshake 
messages - THC-SSL tool, potential DoS"; flow:established,to_server; ssl_state:!client_hello; content:"|16 03 01|"; 
depth:3; detection_filter:track by_src,count 25, seconds 2; reference:url,www.thc.org/thc-ssl-dos/; 
classtype:attempted-dos; sid:20437; rev:2;)
/mab

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