Couple of things. Firstly, Displayprojection is map setting, not a
layer. It controls what will be displayed in things like the
mousePosition control.
Secondly, doesnt matter what projection you specify for a WMS layer that
is not the baselayer. Openlayers will generate a request to the WMS
server in the projection of your current baselayer. You can use the NET
tab on firebug or similar to see the request. Do a getcaps call to the
mapserver to see whether it supports the EPSG of your base layer (which
it sounds like is 3857).
It can be very irritating when you have two wmsservers that have
mutually-incompatible SRS codes for the same projection. You can get
around it with an override (did for ages on the arcgis servers before
they got 3857). But first want a
http://yourserver?request=GetCapabilities&service=WMS to get the
supported projections.
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