Details: A big chunk of our requests to /conversion api are all of a sudden failing as of today, our logs showing:

GroupDocs.Merger Cloud Product Family
1

[2026/08/19 13:45:49] Failed to convert document: Error while parse server error: SyntaxError: Unexpected token ‘<’, “<h”… is not valid JSON
[2026/08/19 13:45:49] createFileForCertifiedFinalTranslation: Couldn’t write converted PDF file for “Beline-Thibaut_OCR_PR-4499ee60” - The “data” argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received undefined. these are triggered by groupdocs conversion requests. the responses are html → which points toward some gateway error most likely. opic/Subject: DOCX conversion request failure
Details:

A big chunk of our requests to /conversion api are all of a sudden failing as of today, our logs showing:
[2026/08/19 13:45:49] Failed to convert document: Error while parse server error: SyntaxError: Unexpected token ‘<’, “<h”… is not valid JSON
[2026/08/19 13:45:49] createFileForCertifiedFinalTranslation: Couldn’t write converted PDF file for “Beline-Thibaut_OCR_PR-4499ee60” - The “data” argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received undefined

This happens sporadically, there is no way for us to understand what is going wrong, other than that the responses seem to be invalid, possibly gateway errors.

2

Hi, @anitauts, I see there are all your requsts (by your customer email) were succeeded, however, the parsing errors in your app really may be gateway errors in html format, so requests not always reach API handler.

Please provide the error text, if possible, and also provide a detailed request and response. It is also important to know which method is throwing the error, as storage and conversion methods are processed by different services.

3

[2026/09/04 13:15:35] convertDocument: attempt 1 failed
{
“message”: “AmazonS3 Storage exception: One or more errors occurred. (The SSL connection could not be established, see inner exception.)”,
“code”: “error”
}
[2026/09/04 13:15:38] convertDocument: attempt 2 failed
{
“message”: “AmazonS3 Storage exception: One or more errors occurred. (The SSL connection could not be established, see inner exception.)”,
“code”: “error”
}
[2026/09/04 13:15:43] Failed to convert document: AmazonS3 Storage exception: One or more errors occurred. (The SSL connection could not be established, see inner exception.)
{
“message”: “AmazonS3 Storage exception: One or more errors occurred. (The SSL connection could not be established, see inner exception.)”,
“code”: “error”
}
[2026/09/04 13:15:43] createFileForCertifiedFinalTranslation: Couldn’t write converted PDF file for “Conditional-Release-Letter- Tr-a02f6a33” - AmazonS3 Storage exception: One or more errors occurred. (The SSL connection could not be established, see inner exception.)
[2026/09/04 13:15:43] Generate-Cert: Error while generating certificate file: {“message”:“AmazonS3 Storage exception: One or more errors occurred. (The SSL connection could not be established, see inner exception.)”,“code”:“error”}
[2026/09/04 13:15:43] Auto-Cert: Error while generating certificate file: {}

4

@anitauts

We apologize for the incident. We experienced a failure in the storage system today. The issue has been resolved, and we have taken measures to prevent similar incidents in the future.