[gdal-dev] GDALWMS - error: TCP connection reset by peer

[Rahkonen Jukka (MML)]

Hi,

It seems that the WMS server is closing the door and there is nothing else to do on the GDAL side except to try again later. Contact the WMS service maintainer and report your troubles. They may be able to provide you a more reliable service especially if you are ready to pay for it.

-Jukka Rahkonen-

Lähettäjä: gdal-dev <gdal-dev-bounces at lists.osgeo.org> Puolesta Roman Breitfuss-Schiffer
Lähetetty: torstai 18. marraskuuta 2021 11.59
Vastaanottaja: gdal-dev at lists.osgeo.org
Aihe: [gdal-dev] GDALWMS - error: TCP connection reset by peer


Dear all!

We are running a Python application an a linux distribution (RedHat) which creates clips in MBTILES format from a WMS. We are using the Python-API and are basically doing something like this:

src_ds = gdal.Warp(
    tmp_file,
    ds_in,
    format='GTiff',
    outputBounds=[bbox[0], bbox[2], bbox[1], bbox[3]],
    dstSRS=output_srs,
)
ds_out = gdal.Translate(
    out_filepath,
    src_ds,
    format='MBTILES',
    creationOptions=creation_options,
)

The application throughs an error from time to time since a few days. We couldn't figure out a pattern yet and therefore we are also not able to reproduce the error. The error is the following:

Mon Nov 15 13:48:13 2021: CPLError: GDALWMS: Unable to download block 2765, 602.
URL: TCP connection reset by peer
  HTTP status code: 0, error: TCP connection reset by peer.
Add the HTTP status code to <ZeroBlockHttpCodes> to ignore this error (see http://www.gdal.org/frmt_wms.html).
Mon Nov 15 13:48:13 2021: CPLError: /wms_xml/wms_config.xml, band 1: IReadBlock failed at X offset 2764, Y offset 601
Mon Nov 15 13:48:13 2021: CPLError: GetBlockRef failed at X block offset 2764, Y block offset 601

The exact same data gets processed successfully in one run and not successfully in another run. We didn't change the code nor the Python or GDAL version. Hence, we are kind of puzzled as the error comes and goes seemingly at random.

Does anyone of you have any hints?

Thanks & best regards!
Roman

_______________________________________________

Dipl.-Ing. Roman Breitfuss-Schiffer, MSc. (GIS)
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