Ticket #173 (new Bug)
Opened 6 years ago
DNS caching problems on SMTP servers
| Reported by: | abligh | Owned by: | Cyrus Daboo |
|---|---|---|---|
| Priority: | major | Milestone: | unassigned |
| Component: | Application | Version: | v4.0.7 |
| Severity: | Serious | Keywords: | |
| Cc: | Operating System: | Windows | |
| OS Version: |
Description
I just changed the IP address of a mail server on which several mulberry users have an SMTP account. The TTL on the DNS had been taken down to 5 seconds so that clients DNS caches would not contain the out of date information for long. However, it appears that Mulberry seems to cache the IP address of the DNS server seemingly forever - on Win32 "ipconfig /flushdns" did not appear to be sufficient to get it working again. Restarting Mulberry fixed the problem. Keeping a cached IP address locally is a bad idea to start off with (that's what the system DNS cache is for), and keeping indefinitely is a worse idea! I am pretty sure this is a bug, but don't want to go renumbering servers to check it.
It seems that whilst SMTP accounts suffered, IMAP accounts didn't. I think IMSP suffered too.
Alex
