Re: How Do i find the listed functions of DNSAPI

From: William Stacey [MVP] (staceywREMOVE_at_mvps.org)
Date: 10/07/04 

Date: Thu, 7 Oct 2004 11:08:55 -0400

I replied to email but will post here. Can't really help with dnsapi.dll as
I wrote my own resolver in c# so I did not run into this issue (but probably
1000 others while developing.) With some pushing I could probably dress it
up into a general library with docs (have been meaning to do that.) hth 

-- 
William Stacey, MVP
"lloyd" <lloydmonteiro@rediffmail.com> wrote in message
news:e783765f.0410062124.7f1cb30c@posting.google.com...
> 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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