inside the mind of a linux admin

imapd: Error: Input/output error

So your IMAP mail is failing. Your e-mail client disconnects with an error related to bad authentication or simply “connection closed by remote server”. Check your mail logs, and you find:

May 25 17:52:43 vps imapd: Failed to create cache file: maildirwatch (
May 25 17:52:43 vps imapd: Error: Input/output error
May 25 17:52:43 vps imapd: Check for proper operation and configuration
May 25 17:52:43 vps imapd: of the File Access Monitor daemon (famd).

Found this obscure error in the system logs for IMAP. The server does not run “famd”. Make any sense? Not really. Though verbose, the output is indicative of nothing related to famd, I/O, or the cache file.

I first restarted the courier-auth daemon, which alleviated the failed login issue (seen as authentication failed or connection closed on most IMAP clients).

Second, edit the file:


and make sure IMAP_USELOCKS and IMAP_ENHANCEDIDLE are both set to 0, after that restart courier-imap:

/etc/init.d/courier-imap restart

Done, and done.

Related Posts

synergy: How to enable crypto (encryption) and generate SSL certificate

The newer Linux versions of the popular mouse/keyboard sharing application “synergy” now has built in encryption. Here’s how to configure it: Just simply passing the –enable-crypto flag on your synergy server without having a proper SSL certificate will result in the inability to connect to clients and generate an error message similar to this in […]

Read More

Change Number Pad Delete (dot) key from a comma in Ubuntu Linux

I recently purchased a new keyboard and updated to the latest Ubuntu, I’m also an avid user of the number pad for quick input when dealing with spreadsheets or accounting. I found that my num pad’s delete key (“.”) was outputting a comma (“,”) instead. Pretty annoying? I agree, but this can be very easily […]

Read More

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Tweeter button Facebook button Myspace button