[MS4W-Users] MS4W 3.1.0-beta1 - possible bug?

TC Haddad tchaddad at gmail.com
Mon Aug 26 19:36:14 EST 2013

Jukka Rahkonen reported an issue on the mapserver list when testing MS4W


I have the same issue using the same MS4W 3.1.0beta1.

Basically, requests to remote WMS servers using image/png as the format
will fail, while the same services work fine using requests of type
image/jpeg. The error reported by Mapserver is:

drawGDAL(): Unable to access file. GDALDatasetRasterIO() failed:
GetBlockRef failed at X block offset 0, Y block offset 0

msDrawMap(): WMS connection error. Failed to draw WMS layer named 'test'.
This most likely happened because the remote WMS server returned an invalid
image, and XML exception or another unexpected result in response to the
GetMap request. Also check and make sure that the layer's connection URL is

The exact requests to the same remote servers work fine when tested in
versions of MS4W prior to this beta, so the connection URLs are working
fine - Mapserver/GDAL just seems to not like receiving the incoming png
format for some reason.

Does anyone else have this problem?
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