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Cisco SDM loses router connection when delivering commands

Posted on 2009-05-13
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Last Modified: 2012-05-06
When configuring a router (Cisco 2851) using Cisco SDM, the SDM loses connection to the router and closes with this error:
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Connection lost.

SDM lost the connection to your router because of a communication error.  SDM will shut down when you click the OK button.

Re-launch SDM to continue working. Enter the same URL you used to re-start SDM.
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Question by:fd1906
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Expert Comment

by:Don Johnston
ID: 24375987
Sounds like you're changing something that affects your connection. Like something on the interface.

What are you doing when you lose the connection?
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Author Comment

by:fd1906
ID: 24376128
I was originally trying to configure a basic firewall, however, even doing something as trivial as adding an interface description will cause the error as well.
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Accepted Solution

by:
MelloBoy earned 250 total points
ID: 26597271
go to Tools > Internet Options > Advanced. Then scroll to the Security section, check Allow active content to run in files on my computer, and click Apply. Then relaunch Cisco SDM and leave HTTPS option unchecked, worked for me
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