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Security was put into place to protect the GDS server for users
over-subscribing and taking the system down. The intention was to
block only malicious users, but this turned out to not be the case.
At 14Z today the changes were completely backed out. If you are
still having problems accessing nomads.ncep GDS please email our
helpdesk at <a class="moz-txt-link-abbreviated" href="mailto:ncep.pmb.dataflow@noaa.gov">ncep.pmb.dataflow@noaa.gov</a><br>
<br>
Carissa Klemmer<br>
NCEP Central Operations <br>
<br>
<div class="moz-cite-prefix">On 08/26/2013 02:27 PM, Wesley
Ebisuzaki - NOAA Federal wrote:<br>
</div>
<blockquote
cite="mid:CAMHOGenS40sBDqVt8b_WGQXGbxeUP8isw7x-AnKvHXRgznpi2w@mail.gmail.com"
type="cite">Erik,<br>
<br>
I am not involved with the <a moz-do-not-send="true"
href="http://nomads.ncep.noaa.gov">nomads.ncep.noaa.gov</a>
server except as a user. Clarissa said that people<br>
who accessed GDS too frequently got an access denied. My guess
is that IP addresses that accessed<br>
the GDS server too many times in one minute (my guess) were denied
service for a short period time (5 minutes?).<br>
Your NAM download script may be fine but GFS and RAP scripts are
accessing the data too many times. My suggestions<br>
are to combine downloads and add some sleep commands into your
script.<br>
<br>
You might consider using grib-filter.<br>
<br>
Wesley<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<div class="gmail_quote">On Mon, Aug 26, 2013 at 12:59 PM, Erik D.
Kabela <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:ekabela@gmail.com" target="_blank">ekabela@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Hi Wesley: I am noticing another error and it
has occurred for both the GFS and RAP data (or at least the
latest attempts to grab the data). The error (specifically
for the GFS) is:
<div>
<br>
</div>
<div>Error: nc_open failed to open file <a
moz-do-not-send="true"
href="http://nomads.ncep.noaa.gov/dods/gfs_hd/gfs_hd20130826/gfs_hd_12z"
target="_blank">http://nomads.ncep.noaa.gov/dods/gfs_hd/gfs_hd20130826/gfs_hd_12z</a></div>
<div>NetCDF: Malformed or inaccessible DAP DDS</div>
<div>gadsdf: Couldn't ingest SDF metadata</div>
<div><br>
</div>
<div>Again, the same sort of error occurred for the RAP
data. NAM appears to be running normally.</div>
<div><br>
</div>
<div>Any help you can provide would be great!</div>
<div>Thanks!</div>
<div>Erik</div>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Mon, Aug 26, 2013 at 11:07 AM,
Wesley Ebisuzaki - NOAA Federal <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:wesley.ebisuzaki@noaa.gov"
target="_blank">wesley.ebisuzaki@noaa.gov</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Erik,<br>
<br>
If your problem is with <a moz-do-not-send="true"
href="http://nomads.ncep.noaa.gov" target="_blank">http://nomads.ncep.noaa.gov</a>,
then the servers home page says,<br>
<br>
"<font>Due to unfortunate server failures on 7/5/2013
NCEP had to place customers onto a new NOMADS server
that has yet to be optimized. We realize that users
have been impacted by this in numerous ways. As we
spend the next few weeks tuning the server it will be
very helpful if you notify us of any issues that are
not within your normal tolerance. Please include the
syntax and errors you are seeing to <b><a
moz-do-not-send="true"
href="mailto:ncep.pmb.dataflow@noaa.gov"
target="_blank">ncep.pmb.dataflow@noaa.gov</a>"<br>
</b></font><br>
It's easier for dataflow to fix the problem when they
know about it.<br>
<br>
Wesley<br>
<div class="gmail_quote">
<div>
<div><br>
<br>
<br>
<br>
On Mon, Aug 26, 2013 at 10:07 AM, Erik D. Kabela <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:ekabela@gmail.com"
target="_blank">ekabela@gmail.com</a>></span>
wrote:<br>
</div>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<div>
<div dir="ltr">Hello All: For about the past
3-4 days my GrADS scripts have been failing to
grab data from the DODS server at NCEP. The
message I receive (for example) is:
<div><br>
</div>
<div>403 Forbidden</div>
<div>You don't have permission to access
/dods/rap/rap20130826/rap_12z</div>
<div>sdfdeflev: nc_get_vara_double failed to
read coordinate axis values</div>
<div><br>
</div>
<div>I'm using GrADS v2.0.a9. I get a similar
error when trying to access GFS data.</div>
<div><br>
</div>
<div>Any help would be appreciated!</div>
<div><br>
</div>
<div>Thanks!</div>
<span><font color="#888888">
<div>Erik Kabela</div>
</font></span></div>
<br>
</div>
</div>
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