Re: [Evolution] 3.16.3: Failed to refresh folder "INBOX",

[Eugene Kanter <eugene bct bz>]

Clarification:

DNS server is hosted on the same test system as evolution client - DNS
updates are instantaneous.

The expected behavior is to re-query DNS record when connection timeout
occurred instead of blindly and indefinitely try the same IP address. 

Eugene.

On Tue, 2015-06-23 at 09:24 +0100, Pete Biggs wrote:
> > Connect to an IMAP server, retrieve email. Move IMAP server to 
> > another
> > address, change DNS record, attempt to retrieve email again. 
> > Evolution
> > indefinitely keeps trying previous IP address, displaying an error
> > "Connection timed out".
>
> Yes, sounds reasonable to me - in my experience any changes to DNS
> records take a little while to settle down.  DNS entries have a
> lifetime - this lifetime is server configurable and can be anything
> from a few minutes to days depending on how often the administrator 
> of
> the DNS thinks the  entries are likely to change.  The lifetime 
> allows
> the clients to cache the DNS results and most clients won't bother to
> query the DNS again until the entry would have expired.
>
> And it's not an Evolution issue: I very much doubt Evolution is doing
> the actual DNS lookups - after all, that's what libraries are for.
>
> Don't get confused by using utilities such as nslookup - they perform
> the DNS queries themselves so by-pass the cache.