socket_connect() unable to connect [115]: Operation now in progress

Hi all, Can anyone explain why I might get a: socket_connect(): unable to connect [115]: Operation now in progress error on a blocking socket? The documentation seems to suggest that is a 'normal' response for a non-blocking socket but I am seeing it on a blocking socket. Example code: ==== $this->logSocket = socket_create ( AF_INET, SOCK_STREAM, SOL_TCP ); socket_set_block($this->logSocket); socket_set_option ( $this->logSocket, SOL_SOCKET, SO_SNDTIMEO, array ('sec' => 2, "usec" => 0 ) ); $this->loggerConnected = socket_connect ( $this->logSocket, $this->logHost, $this->logPort ); if (! $this->loggerConnected) user_error ( 'Error connecting to ' . $this->logHost . ' ' . $this->logPort ); ==== The port it is connecting to is running on localhost. It works roughly 99.9% of the time but occasionally fails with the error above. Paul