I am syncing the channels with the following command, it completes without any error.
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server1:~ # mgr-ncc-sync
Updating Channel Family Information
Downloading Product information...
Found 601 products using 1 mirror credentials.
Downloading Subscription information...
Found 8 subscriptions using 1 mirror credentials.
Updating Upgrade Path Information
Scheduling repo sync for all installed channels...
server1:~ #
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But none of the channels are listing in the backend or in the webinterface

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server1:~ # mgr-ncc-sync -l
Listing channels ...

Status:
- P - channel is installed (provided)
- . - channel is not installed, but is available
- X - channel is not available

server1:~ #
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What could be the problem?