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

[Roman Breitfuss-Schiffer]

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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