Documents are not able to open

We are facing the below error message when we are opening a file


2021/10/02 19:06:06 [error] 18868#18868: *407 connect() failed (111: Connection refused) while connecting to upstream, client:, server: onlyoffice[.]domain[.]com, request: “GET /5.3.4-3//spellchecker/doc/4247521224/c/info?t=1633194387298 HTTP/1.1”, upstream: “http://[::1]:8080/doc/4247521224/c/info”, host: “onlyoffice[.]domain[.]com”, referrer: “https://onlyoffice[.]domain[.]com/5.3.4-3//web-apps/apps/documenteditor/main/index.html?_dc=5.3.4-3&lang=es&customer=ONLYOFFICE&frameEditorId=iframeEditor”

Operating system CentOS Linux release 7.6

supervisorctl status

ds:converter RUNNING pid 13107, uptime 0:18:29
ds:docservice RUNNING pid 13091, uptime 0:18:30
ds:gc RUNNING pid 13083, uptime 0:18:30
ds:metrics RUNNING pid 13067, uptime 0:18:30
ds:spellchecker RUNNING pid 13068, uptime 0:18:30

Please help

Based on the error entry I can see that you are using a very old Document Server version (5.3.4). Current version is 6.4.1. Please update your Document Server.