OnlyOffice conversion error (-83) when processing large XLS files

Docs
1

Dear all,

I am using OnlyOffice Document Server v9.3.1 on a Red Hat Enterprise Linux 9 environment with 16GB RAM.

I am using the conversion API to convert XLS files to XLSX format.

For small files, the conversion works without any issues.
However, when converting a large file (~1GB), the process sometimes succeeds, but occasionally fails with the following error in the docservice log:

/var/log/onlyoffice/documentserver/docservice/out.log

[2026-03-26T13:40:26.801] [ERROR] [localhost] [conv_71dc35dc2b984a53] [userId] nodeJS - convert-to error status:{"err":-83,"end":false}

Could you please advise on the possible cause of this issue and how to resolve it?

Best regards,

3

Hi @anhtt,

To fix this, try to increase a few limits:

  1. In /etc/onlyoffice/documentserver/local.json, raise FileConverter.converter.timeout (default is 120000 ms — try 600000) and FileConverter.converter.maxDownloadBytes to at least 2GB.

  2. In your nginx config, raise proxy_read_timeout (e.g. 600) and client_max_body_size (e.g. 2g).

  3. Restart services: systemctl restart ds-* && nginx -s reload

If the issue persists, could you share the logs from /var/log/onlyoffice/documentserver/ captured during a failed conversion?