Run strace and ltrace to figure out why DNS resolution is different.

Check your nsswitch.conf and understand what it does (not easy).

Proceed from there

On 24 Aug 2016 19:52, "Peter Binney via curl-and-python" <
curl-and-python_at_cool.haxx.se> wrote:

> I started getting this error when running pycurl to a NAS box on my LAN
> after I moved to another ISP (and hence broadband box):
> pycurl.error: (6, 'Could not resolve: nas-29-ee-87 (Domain name not
> found)')
>
> Curl does not have the problem when accessing the same URL.
> Pycurl does not have the problem when accessing URL's on the Internet.
>
> I am running on Windows10.
>
> pycurl.version shows: PycURL/7.43.0 libcurl/7.47.0 OpenSSL/1.0.2e
> zlib/1.2.8 c-ares/1.10.0 libssh2/1.6.0
>
> # START OF pycurl program that errors
> import io
> import pycurl # Currently (Nov 2014) using 7.19.5 against libCurl 7.37
> import sys
> url = "http://nas-29-ee-87/" # Change this to "http://www.google.co.uk/"
> and no problem
>
> c = pycurl.Curl()
> print("fetch(" + url + ") using " + pycurl.version)
> c.setopt(pycurl.URL, url)
> c.setopt(pycurl.SSL_VERIFYPEER, False) # equivalent to curl's -k /
> --insecure
> c.setopt(pycurl.SSL_VERIFYHOST, False) # equivalent to curl's ???? Had
> to add for NAS access after pyCurl upgrade to 7.21.5 (from 7.19.5)
>
> fPointer = io.BytesIO()
> c.setopt(pycurl.WRITEFUNCTION, fPointer.write)
> c.perform() # <=== ERRORS ON THIS LINE
> # END OF pycurl program that errors
>
> This curl command runs fine on both my Windows10 and a Ubuntu PC on the
> same LAN:
> curl http://nas-29-ee-87/
>
>
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>

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Received on 2016-08-25