En la web app RTC / "CONSULTA DE CESIONES EN PERÍODO", al enviar una consulta de las "cesiones en periodo" con los siguientes parámetros se recibió una respuesta HTTP 200 cuyo texto era "Error al leer datos(-999)".
curl 'https://palena.sii.cl/cgi_rtc/RTC/RTCConsultaCesiones.cgi' \
-X POST \
-H 'Connection: keep-alive' \
-H 'Pragma: no-cache' \
-H 'Cache-Control: no-cache' \
-H 'Origin: https://palena.sii.cl' \
-H 'Upgrade-Insecure-Requests: 1' \
-H 'Content-Type: application/x-www-form-urlencoded' \
-H 'User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36' \
-H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3' \
-H 'Referer: https://palena.sii.cl/cgi_rtc/RTC/RTCConsultaCesionesHtml.cgi' \
-H 'Accept-Encoding: gzip, deflate, br' \
-H 'Accept-Language: en-US,en;q=0.9,es-CL;q=0.8,es;q=0.7' \
-H 'Cookie: s_cc=true; NETSCAPE_LIVEWIRE.rut=***; NETSCAPE_LIVEWIRE.rutm=***; NETSCAPE_LIVEWIRE.dv=***; NETSCAPE_LIVEWIRE.dvm=***; NETSCAPE_LIVEWIRE.clave=***; NETSCAPE_LIVEWIRE.mac=***; NETSCAPE_LIVEWIRE.exp=20190730220524; NETSCAPE_LIVEWIRE.sec=0000; NETSCAPE_LIVEWIRE.lms=120; TOKEN=***; CSESSIONID=***; RUT_NS=***; DV_NS=***; NETSCAPE_LIVEWIRE.locexp=Wed%2C%2031%20Jul%202019%2002%3A05%3A24%20GMT; MISII={"p":false}; EMG=***; rxVisitor=***; dtSa=-; dtLatC=17; dtCookie=***; dtPC=***; rxvt=***; s_sq=***' \
--data 'TIPOCONSULTA=0&TXTXML=TXT&DESDE=01072019&HASTA=30072019' \
--compressed
Connection: Keep-Alive
Content-Language: es
Content-Length: 29
Content-Security-Policy: default-src https: data: 'unsafe-inline' 'unsafe-eval'
Content-Type: text/html; charset=ISO-8859-1
Date: Wed, 31 Jul 2019 01:01:44 GMT
Keep-Alive: timeout=5
Server: version 1.1 version 1.2 Apache
Strict-Transport-Security: max-age=31536000; includeSubDomains
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
<br>Error al leer datos(-999)