I am syncing the channels with the following command, it completes without any error.
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:~ #

But none of the channels are listing in the backend or in the webinterface

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

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

server1:~ #

What could be the problem?