Knut,

A couple of possible reasons that make perfect sense. 

First, a number of ISPs intercept port 80 traffic (http) for advertising or 
cache purposes but don’t do the same for the ftp port; if the cache or 
advertising machine has DNS issues, so will anything downstream. 

Second, ftp and http may point to different IP addresses — for example my file 
and web servers are different machines so are on different addresses. Added to 
which they have different TTL values too.

I hope this helps.

Regards
Andy, G8TQH

> On 4 Jan 2016, at 21:30, ab2tc <[email protected]> wrote:
> 
> Hi all,
> 
> If this is a DNS problem, how come everybody (including me) can ftp to the
> site without any problem. It doesn't make any sense.
> 
> AB2TC - Knut
> 


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