Cannot upload file: Unknown server error (404)


for some unknown reason, we cannot upload files larger than approximately 26 mb in size to our JIRA instance. Our max attachment size is 100 mb, and the server storage size is 300+ gb.

We can upload files <25 mb without any issues at all, but as soon as you break that 25-26 mb boundry it throws that error in the subject line.

I cannot peg the source.

We're running a stand alone.

Windows Server 2008 R2 6.1

App container; Apache Tomcat/7.0.29

JIRA version 6.0.0

Any help is appreciated.



3 answers

This widget could not be displayed.

Hi Adam

After making the change in the attachment size as set in this documentation:

You need to restart your instance to make the changes replicate.


Ricardo Carracedo.

Hello Ricardo,

I just restarted the instance, it made no difference. :(

Thanks for trying.


This widget could not be displayed.

Hey Adam,

if you are behind a proxy you should configure the max allowed size of attachments.


No, we're sitting inside the same network firewall as the instance.

This widget could not be displayed.

It appears there was a session limit by default within IIS7 which was set to 30,000,000 bytes. We ameneded this so that we could upload files up to 100mb in size and it now works fine.

Thanks all for the help.

Suggest an answer

Log in or Sign up to answer
Community showcase
Posted yesterday in Jira

Atlassian Research Workshop opportunity on Sep. 28th in Austin, TX

We're looking for participants for a workshop at Atlassian! We need Jira admins who have interesting custom workflows, issue views, or boards. Think you have a story to sha...

40 views 2 2
Join discussion

Atlassian User Groups

Connect with like-minded Atlassian users at free events near you!

Find a group

Connect with like-minded Atlassian users at free events near you!

Find my local user group

Unfortunately there are no AUG chapters near you at the moment.

Start an AUG

You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs

Groups near you