ssl write failed

[Sean Allen]

2008/05/09 18:25:44 [crit] 15521#0: *168933 SSL_write() failed (SSL:  
error:1409F07F:SSL routines:SSL3_WRITE_PENDING:bad write retry) while  
sending to client, client: 81.252.180.89, server:  
secure.thepinkpatch.co.uk, request: "GET /s-TPP/lp HTTP/1.0",  
upstream: "memcached://127.0.0.1:11211", host:  
"secure.thepinkpatch.co.uk"

is this an error in the underlying ssl code or in nginx?