If clicking Download All Attachments ends up in Confluence server error, the reason is as follows.
Clicking this button makes Confluence save all attachments to disk to create a zip file. But as you can see, it has some png files with time separated by : , these are images copy pasted to the page. The problem is, unlike *nix, Windows doesn’t allow to have special characters in the filenames. So, trying to save such files to disk just results in crash. Obviously, Atlassian developers failed to port their software from *nix to Windows the proper way.
So, in this particular case you’ll have to download attachments manually. In the future, either avoid copy-pasting images or migrate your Confluence installation from Windows to *nix.
A system error has occurred - our apologies!
For immediate troubleshooting, consult our knowledge base for a solution.
If you would like to receive support from Atlassian's support team, ask your Confluence administrator to create a support issue on Atlassian's support system with the following information:
a description of your problem and what you were doing at the time it occurred
a copy of the error and system information found below
a copy of the application logs (if possible).
Your Confluence administrator can use the support request form to create a support ticket which will include this information.
We will respond as promptly as possible.
Thank you!
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Cause
java.io.FileNotFoundException: C:\Program Files\Atlassian\Application Data\Confluence\temp\downloadpOl9c110627\image2012-12-24 18:24:3.png (The filename, directory name, or volume label syntax is incorrect)
at java.io.FileOutputStream.open(Native Method)
Stack Trace:[hide]
java.io.FileNotFoundException: C:\Program Files\Atlassian\Application Data\Confluence\temp\downloadpOl9c110627\image2012-12-24 18:24:3.png (The filename, directory name, or volume label syntax is incorrect)
at java.io.FileOutputStream.open(Native Method)