Am 28.08.2014 um 14:11 schrieb Andrea Aime:
> Can you share a direct way to reproduce, like a public wms where this
> happens?
> We're very short on time, it's unlikely that someone will spend time to
> reproduce it
> unless it works at the first random attempt with another local wms server

Ok, this one is freely available:
http://sg.geodatenzentrum.de/wms_webatlasde.light?request=GetCapabilities&service=wms

I just tried with a new 2.6.x installation from
http://ares.boundlessgeo.com/geoserver/2.6.x/geoserver-2.6.x-2014-08-28-war.zip

Steps to reproduce:
- in "Global Settings": [x] Verbose Messages,
  [x] Verbose Exception Reporting,
  Logging Profile: "VERBOSE_LOGGIN.properties"

- add new store "WMS - Cascades a remote Web Map Service":
  Workspace "topp", WMS Source Name "WebAtlasDe.light", [X] Enabled,
  Capabilities URL:
http://sg.geodatenzentrum.de/wms_webatlasde.light?request=GetCapabilities&service=wms

- publish layer "webatlasde.light":
  Declared SRS: "EPSG:31467"
  SRS handling: "Reproject native to declared"
  Bounding Boxes: click on links "Compute from data" and "Compute from
native bounds"

- hit Server with:
http://<localserver>/geoserver/wms?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&BBOX=3474000,5840000,3474500,5840500&SRS=EPSG:31467&WIDTH=500&HEIGHT=500&LAYERS=topp:webatlasde.light&STYLES=&FORMAT=image/jpeg

Result:
- white image (500x500px)

- server-logs:
[...]
> 2014-08-28 15:12:23,102 DEBUG [ows.OWSHandlerMapping] - Mapping [/wms] to 
> HandlerExecutionChain with handler [org.geoserver.ows.Dispatcher@4516bb65] 
> and 1 interceptor
[...]
> 2014-08-28 15:12:23,105 DEBUG [geotools.util] - InterpolationConverterFactory 
> can be applied from Strings to Interpolation  only.
> 2014-08-28 15:12:23,105 DEBUG [geotools.util] - CRSConverterFactory can be 
> applied from Strings to CRS  only.
> 2014-08-28 15:12:23,105 DEBUG [geotools.util] - InterpolationConverterFactory 
> can be applied from Strings to Interpolation  only.
> 2014-08-28 15:12:23,105 DEBUG [geotools.util] - CRSConverterFactory can be 
> applied from Strings to CRS  only.
> 2014-08-28 15:12:23,109 DEBUG [geoserver.ows] - Getting layers and styles 
> from LAYERS and STYLES
> 2014-08-28 15:12:23,109 DEBUG [geoserver.ows] - establishing null style for 
> topp:webatlasde.light
> 2014-08-28 15:12:23,117 DEBUG [geoserver.wms] - setting up map
> 2014-08-28 15:12:23,118 DEBUG [wms.map] - setting up 500x500 image
[...]
> 2014-08-28 15:12:23,134 DEBUG [geotools.map] - Issuing request: 
> http://sg.geodatenzentrum.de/wms_webatlasde.light?SERVICE=WMS&LAYERS=webatlasde.light&CRS=EPSG:4326&FORMAT=image%2Fpng&HEIGHT=11&TRANSPARENT=FALSE&BGCOLOR=0xFFFFFF&REQUEST=GetMap&BBOX=52.642809609914,8.540778953125084,52.741456629764,8.703143421106123&WIDTH=11&STYLES=&VERSION=1.3.0
> 2014-08-28 15:12:23,200 DEBUG [data.ows] - Executed request to URL: 
> http://sg.geodatenzentrum.de/wms_webatlasde.light?SERVICE=WMS&LAYERS=webatlasde.light&CRS=EPSG:4326&FORMAT=image%2Fpng&HEIGHT=11&TRANSPARENT=FALSE&BGCOLOR=0xFFFFFF&REQUEST=GetMap&BBOX=52.642809609914,8.540778953125084,52.741456629764,8.703143421106123&WIDTH=11&STYLES=&VERSION=1.3.0
[...]
> 2014-08-28 15:12:23,214 DEBUG [operation.transform] - Optimizing the warp 
> into an affine transformation: AffineTransform[[1.006349355532817, 
> 0.006404195129459, -0.070079899634152], [-0.005275504334846, 
> 1.005199275256101, 4.37009055531E-4]]
> 2014-08-28 15:12:23,217 DEBUG [coverage.processing] - Resampled coverage 
> "WebAtlasDE.light" from coordinate system "WGS 84" (for an image of size 
> 11Ã11) to coordinate system "DHDN / 3-degree Gauss-Kruger zone 3" (image size 
> 11Ã11). JAI operation is "Warp" with "Nearest" interpolation on geophysics 
> pixels values. Background value is (255, 255, 255).
[...]


Result with 2.5.2:
- correct image:
http://sg.geodatenzentrum.de/wms_webatlasde.light?SERVICE=WMS&LAYERS=webatlasde.light&CRS=EPSG:31467&FORMAT=image%2Fjpeg&HEIGHT=500&REQUEST=GetMap&BBOX=5840000.0,3474000.0,5840500.0,3474500.0&WIDTH=500&STYLES=&VERSION=1.3.0

- server-logs:
> 2014-08-28 15:16:22,320 DEBUG [ows.OWSHandlerMapping] - Mapping [/wms] to 
> HandlerExecutionChain with handler [org.geoserver.ows.Dispatcher@fb80fcc] and 
> 1 interceptor
[...]
> 2014-08-28 15:16:22,331 DEBUG [geoserver.ows] - Getting layers and styles 
> from LAYERS and STYLES
> 2014-08-28 15:16:22,332 DEBUG [geoserver.ows] - establishing null style for 
> trailpro:webatlasde.light
> 2014-08-28 15:16:22,354 DEBUG [geoserver.wms] - setting up map
> 2014-08-28 15:16:22,355 DEBUG [wms.map] - setting up 500x500 image
> 2014-08-28 15:16:22,362 DEBUG [geotools.map] - Issuing request: 
> http://sg.geodatenzentrum.de/wms_webatlasde.light?SERVICE=WMS&LAYERS=webatlasde.light&CRS=EPSG:31467&FORMAT=image%2Fpng&HEIGHT=510&TRANSPARENT=FALSE&BGCOLOR=0xFFFFFF&REQUEST=GetMap&BBOX=5839990.0,3473990.0,5840510.0,3474510.0&WIDTH=510&STYLES=&VERSION=1.3.0
> 2014-08-28 15:16:22,590 DEBUG [data.ows] - Executed request to URL: 
> http://sg.geodatenzentrum.de/wms_webatlasde.light?SERVICE=WMS&LAYERS=webatlasde.light&CRS=EPSG:31467&FORMAT=image%2Fpng&HEIGHT=510&TRANSPARENT=FALSE&BGCOLOR=0xFFFFFF&REQUEST=GetMap&BBOX=5839990.0,3473990.0,5840510.0,3474510.0&WIDTH=510&STYLES=&VERSION=1.3.0
> 2014-08-28 15:16:22,655 DEBUG [geotools.rendering] - Drawing coverage 
> GridCoverage2D["WebAtlasDE.light", GeneralEnvelope[(3473990.0, 5839990.0), 
> (3474510.0, 5840510.0)], DefaultProjectedCRS["DHDN / 3-degree Gauss-Kruger 
> zone 3"]]
[...]



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