Well, I verified that all of the hosts listed in your script (including
the ones that were commented out) are reachable via WAN. So, unless there
is some strange iptables setting on the host where you trying this out,
connectivity should not be an issue.
Hoever, cms-xrd-global.cern.ch has an IPv6 address and that address will
be tried first if you are IPv6 enabled (that's an RFC requireent). If your
IPv6 setup is broken then there will be a 2 minute delay before the next
IPv6 address is tried (the host has two IPv6 addresses). Then the IPv4
address will be tried. So, if this is the case it will take 4 minutes to
establish a connection. This may be the problem.
Andy
On Mon, 8 Oct 2018, Valentin Kuznetsov wrote:
> yes, I removed timeout argument from the call. Here is a code now:
> ```
> #!/usr/bin/env python
> from XRootD import client
> from XRootD.client.flags import OpenFlags
> f=client.File()
> redirector='root://cms-xrd-global.cern.ch'
> #redirector='root://xrootd-cms.infn.it'
> #redirector='root://cmsxrootd.fnal.gov'
> fin='%s//store/data/Run2018C/Tau/NANOAOD/14Sep2018_ver3-v1/60000/6FA4CC7C-8982-DE4C-BEED-C90413312B35.root' % redirector
> print(fin)
> data=f.open(fin, OpenFlags.READ)
> print("data", data)
> ```
> and, I tried different redirectors.
>
> My suspicious it is related to the node iptables settings, the node is on a
> Internet2 and may be some settings should be applied to make requests pass
> through. But I don't know what xrootd requires (if any).
>
>
> On 0, Brian P Bockelman <[log in to unmask]> wrote:
>> Hi @vkuznet -
>>
>> For the last log snippet, can you confirm that you decreased the timeout value to be below the amount of time you waited? It wasn't clear from your response whether this was so.
>>
>> Brian
>>
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