[imp] Weird DNS Problem

[Nuno Silva]

I don't know why it's happening, but the quick and dirty fix is:

bash# echo "127.0.0.1 localhost.co.uk" >> /etc/hosts

:)

Regards,
Nuno Silva

Andrew Pritchard wrote:

> I've already checked the FAQ and the mailing list archives for similar 
> questions, but none seem relevant.
> 
> I've set up Horde and Imp on my "Stable Debian 2.2r2" box, and I've been 
> using it for nearly a month now without any problems - indeed it's a fine 
> piece of software. I've got a DNS server set up on the box to serve my 
> internal network which is also running on there, which appears to be 
> working just fine. It will resolve any of the entries in it, as will any 
> of the other clients on the network both forward and reverse. It will also 
> resolve any "real" internet addresses just fine via my ISP's DNS servers. 
> It's using PostgreSQL as the database at the backend, which is the default 
> DB for Horde/IMP under this distribution.
> 
> As I say - I've been using it for about a month now, and all of a sudden 
> there is a problem. The horde framework comes up almost immediately, as 
> expected - so I'd be surprised if this were a resource issue. However when 
> I click on the IMP link, it takes at *least* a minute for the login screen 
> to come up. And everytime I try to perform an action it takes a similar 
> amount of time. In the past I've experienced similar problems with things 
> like POP3/IMAP/Telnet where the server hasn't been able to resolve the IP 
> address of the workstation concerned, and has timed out and gone off and 
> done it anyway. So I put a sniffer on the network and sure enough it's 
> trying to resolve: "localhost.co.uk".
> 
> The IMAP server is on that machine, and yes I'm in the UK, so trying to 
> resolve a UK server would not be unreasonable. But where has it got  
> localhost.co.uk from? And which process is it that's trying to resolve 
> this address - Apache, IMAP, Postgresql or something else that I'm 
> missing.
> 
> The only thing I have changed recently, is the "apt-get upgrade" for the 
> Samba software on there which was the latest security fix, but to be 
> honest I can't see how that could be an issue - the software should be 
> unrelated, and I didn't see any shared libraries being updated as part of 
> that process.
> 
> Everything else seems fine on the machine, including Samba. I will try 
> this evening disabling Samba (which is also running off the Inetd to 
> ensure that's not giving me spurious DNS requests.) I might also try 
> switching off the local DNS server so ensure that is not misconfigured in 
> some odd way. What else should I check? I'm not at all convinced it's an 
> apache problem, the rest of the server (such as it is) is behaving itself 
> - and is as quick as I'd expect it to be. 
> 
> I will also try an 'ordinary' IMAP client to see if there is a similar 
> issue, and watch for the DNS queries whilst I do that.
> 
> How can I check the Postgresql db for misconfiguration? I don't have much 
> experiance with any DB, so it could be a misconfig there. If it is a 
> misconfig here - I don't know how that happened - I know I don't know 
> enough about DB's to not mess with that.
> 
> Yours in hope of a quick resolution,
> 
> Andrew
> 
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