You may also need to check these two onlyoffice logs:
/var/log/onlyoffice/documentserver/converter/out.log
/var/log/onlyoffice/documentserver/docservice/out.log
look for information related to “/onlyoffice/editor-callback/”
[ERROR] nodeJS - sendServerRequest error: docId = 182eca521eb2002ed02d;url = https://files.xhomenet.ru/onlyoffice/editor-callback/;data = {"key":"182eca521eb2002ed02d","status":2,"url":"https://files.xhomenet.ru/onlyofficeds/cache/files/182eca521eb2002ed02d_7608/output.docx/output.docx?md5=0hyt3cLVO5sIOgx0677B9A==&expires=1500406637&disposition=attachment&ooname=output.docx","changesurl":"https://files.xhomenet.ru/onlyofficeds/cache/files/182eca521eb2002ed02d_7608/changes.zip/changes.zip?md5=zR6mOSh5caV4ZGZLIUp11A==&expires=1500406637&disposition=attachment&ooname=output.zip","history":{"serverVersion":"4.3.6","changes":[{"created":"2017-06-18 19:37:08","user":{"id":"uid-1497814620976","name":"xface"}}]},"users":["uid-1497814620976"],"actions":[{"type":0,"userid":"uid-1497814620976"}],"lastsave":"2017-06-18T19:37:08.514Z","notmodified":false}
Error: Error response: statusCode:500 ;body:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
<title>Page unavailable</title>
</head>
<body>
<h1>Page unavailable</h1>
<p>Sorry, but the requested page is unavailable due to a
server hiccup.</p>
<p>Our engineers have been notified, so check back later.</p>
</body>
</html>
at Request._callback (/var/www/onlyoffice/documentserver/server/Common/sources/utils.js:260:18)
at Request.self.callback (/var/www/onlyoffice/documentserver/server/Common/node_modules/request/request.js:188:22)
at emitTwo (events.js:106:13)
at Request.emit (events.js:191:7)
at Request.<anonymous> (/var/www/onlyoffice/documentserver/server/Common/node_modules/request/request.js:1171:10)
at emitOne (events.js:96:13)
at Request.emit (events.js:188:7)
at IncomingMessage.<anonymous> (/var/www/onlyoffice/documentserver/server/Common/node_modules/request/request.js:1091:12)
at IncomingMessage.g (events.js:292:16)
at emitNone (events.js:91:20)
First start docker container: sudo docker run -dit -p 88:80 --restart always --name oods onlyoffice/documentserver
Then used command for start-stop: sudo docker start/stop oods