Re: How Do i find the listed functions of DNSAPI

From: lloyd (lloydmonteiro_at_rediffmail.com)
Date: 10/07/04 

Date: 6 Oct 2004 22:24:45 -0700

Hi ObiWan,

The problem is like this. We are building a SPF record from the
queried Domain DNS.

For example, we type in IBM.Com and it returns the listed
a,mx,ptr,include records and TXT records if any. we then process this
information.

What we noticed is that sometimes for the Domain like IBM.COM it
returns the a,mx,ptr,txt records and sometimes it does not return any
records.
Resulting in our process to fail

We are releasing all the memory allocated to the DNSAPI via system
free resources.

There might be a local DNS server on the Web server that hosts this
application, if so my questions are two fold

1) What does the DNS local server do? If it has cached the Records and
is serving us the records from its store, when and how can it be
serving us wrong Record?

2) How to byPass the local DNS server in code?
3) How to clear the cache on the server, it will have to be done
programmatically as it is a web interface and is open to all users to
query their domain.

Thanks in advance.

"ObiWan" <anzen.NO@SPAM.gmx.net> wrote in message news:<eLGWX42qEHA.2588@TK2MSFTNGP12.phx.gbl>...
> <snip>
> > What we are noticing is the intermittant and
> > weird behaviour of the system, sometimes it
> > does not return any DNS record. Most of the
> > times it does.
> > We are struggling to solve this issue,
>
> Could you explain the problem with some more
> details and/or give an example of the problem
> you're facing ??
>
> Also, are you releasing the resource records
> (buffers) returned from the DnsAPI after parsing
> them ... or are you keeping them "hung" ?
>
> And since I'm at it ... did you try disabling the
> "dnsclient" (cache) service to see if this has
> some effect on the above behaviour ?
>
> That said, I think this thread may as well belong
> to the C# newsgroup .. although, talking about
> DNS it may belong here too
>
> Regards

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