v0.9.3: Error encountered while uploading a user profile picture

[rod]

I attempted to upload a user profile picture and received the following error after the file upload bar went to 100%:

error uploading, code : 502

Looking through my Nginx log files I see this error logged:

2016/02/03 08:26:25 [error] 962#0: *12317 connect() failed (111: Connection refused) while connecting to upstream, client: [MY IP ADDRESS], server: myForumHere.com, request: "GET /socket.io/?EIO=3&transport=polling&t=1454513183873-9 HTTP/1.1", upstream: "http://127.0.0.1:4568/socket.io/?EIO=3&transport=polling&t=1454513183873-9", host: "myForumhere.com", referrer: "https://myForumHere.com/user/myUserName"

(I redacted my client IP address, my forum name, my forum URL, and my actual username.)

I am using the AmazonS3 plugin but I am able to upload the same image into a new topic. Any ideas on what I should check for the root of the problem?

Thank you.

EDIT: Adding additional error found in log:

I found this error in my error logs above the one I previously posted:

2016/02/03 08:26:10 [error] 962#0: *12317 upstream prematurely closed connection while reading response header from upstream, client: [MY IP ADDRESS], server: myForumHere.com, request: "POST /api/user/myUserName/uploadcover HTTP/1.1", upstream: "http://127.0.0.1:4568/api/user/myUserName/uploadcover", host: "myForumHere.com", referrer: "https://myForumHere.com/user/myUserName"

As before I edited [MY IP ADDRESS], myForumHere.com and myUserName.

[rod]

Where on the filesystem do user's profile pictures reside? I want to confirm that the user that Nginx runs under has write access.

[PitaJ]

@rod It wouldn't be Nginx, it would be NodeBB that needs write access.

[rod]

@PitaJ Ok. And yes, the linux user that NodeBB runs under owns all of the directories.

[rod]

After further testing this problem appears to be related to the nodebb-plugin-amazons3 plugin. After I disabled it I was able to upload a user profile picture.