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When I am going to publish mxd (containging image.ecw) to ArcGIS Server, the following error appears:

Confiquration image.ecw. MapServer can not be started. Server Object instance creation failed on machine.

What should I do to resolve this error?

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Do you have image server? – Hairy Jan 27 '12 at 9:37

See this ESRI KB article on publishing ECWs to ArcGIS Server - it requires special (extra) licensing from ERDAS. This may be your issue.

Also, are you able to publish any map service?

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You need the license. Asked for a quote last year and the license started a $3000+ for a 4-Core server up to 5K for a 16-Core... – fgcartographix Sep 11 '13 at 12:55
What are the fastest and the most simple way to convert ECW to other format ? Thanks Geog – Geog Sep 12 '13 at 6:02

You need ERDAS ECW for ArcGIS license to publish ECWs...

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What are the fastest and the most simple way to convert ECW to other format ? Thanks Geog – Geog Sep 12 '13 at 6:02
use global mapper to convert – Sandhya Sep 12 '13 at 12:13
To what format ? who long sulde it take ? – Geog Sep 12 '13 at 13:47
I'v converted The ECW to Raster Catlog and it came out 65 GB - Heavy and not practical- what beter options i have ? Thanks – Geog Sep 13 '13 at 5:40

Convert the ECW into a tile cache. Use ArcMap Data Management Tools > Tile Cache > Manage Tile Cache tool.

If you have many ECW images, you can create a mosaic dataset of ECW images, then use the above tool to create the cache of all the ecw images.

Once a tile cache is built, ArcMap will read this as an image format.

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