[gradsusr] Grads/DODS - Access Denied [SEC=UNCLASSIFIED]

[Ken Kato]

Hi Wesley and all,

Just FYI, I too have been experiencing the same problem with the same error message as Erik since last Friday (and intermittently since all the NOMADS issues began a few months ago). I only access the GFS and global ensemble data about once a day at the most and the problem still occurs, even using different computers with different IP addresses. It also doesn't affect all variables, just certain ones such as RHPRS. I've already posted this info to the ncep.pmb.dataflow at noaa.gov<mailto:ncep.pmb.dataflow at noaa.gov>  list.

Ken.

________________________________
From: gradsusr-bounces at gradsusr.org [gradsusr-bounces at gradsusr.org] On Behalf Of Wesley Ebisuzaki - NOAA Federal [wesley.ebisuzaki at noaa.gov]
Sent: Tuesday, 27 August 2013 4:27 AM
To: GrADS Users Forum
Subject: Re: [gradsusr] Grads/DODS - Access Denied

Erik,

   I am not involved with the nomads.ncep.noaa.gov<http://nomads.ncep.noaa.gov> server except as a user.  Clarissa said that people
who accessed  GDS too frequently got an access denied.  My guess is that IP addresses that accessed
the GDS server too many times in one minute (my guess) were denied service for a short period time (5 minutes?).
Your NAM download script may be fine but GFS and RAP scripts are accessing the data too many times.  My suggestions
are to combine downloads and add some sleep commands into your script.

You might consider using grib-filter.

Wesley







On Mon, Aug 26, 2013 at 12:59 PM, Erik D. Kabela <ekabela at gmail.com<mailto:ekabela at gmail.com>> wrote:
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:

Error: nc_open failed to open file http://nomads.ncep.noaa.gov/dods/gfs_hd/gfs_hd20130826/gfs_hd_12z
NetCDF: Malformed or inaccessible DAP DDS
gadsdf: Couldn't ingest SDF metadata

Again, the same sort of error occurred for the RAP data.  NAM appears to be running normally.

Any help you can provide would be great!
Thanks!
Erik


On Mon, Aug 26, 2013 at 11:07 AM, Wesley Ebisuzaki - NOAA Federal <wesley.ebisuzaki at noaa.gov<mailto:wesley.ebisuzaki at noaa.gov>> wrote:
Erik,

If your problem is with http://nomads.ncep.noaa.gov, then the servers home page says,

"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 ncep.pmb.dataflow at noaa.gov<mailto:ncep.pmb.dataflow at noaa.gov>"

It's easier for dataflow to fix the problem when they know about it.

Wesley




On Mon, Aug 26, 2013 at 10:07 AM, Erik D. Kabela <ekabela at gmail.com<mailto:ekabela at gmail.com>> wrote:
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:

403 Forbidden
You don't have permission to access /dods/rap/rap20130826/rap_12z
sdfdeflev: nc_get_vara_double failed to read coordinate axis values

I'm using GrADS v2.0.a9.  I get a similar error when trying to access GFS data.

Any help would be appreciated!

Thanks!
Erik Kabela

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