Seems the skype clients used by mod_skypopen do not work anymore, probably from yesterday.
Probably Microsoft shut down old skype clients possibility to connect to the skype network.
Last year Microsoft announced that was retiring support for the skype api, used by skypopen, so next clients will no more be compatible with that api.
That was not affecting old clients, they continued to work as always.
Now maybe Microsoft retired possibility for old skype clients to connect to the skype network.
This would be a right of Microsoft, and is clearly stated in their EULA.
Just a pity for skypopen users.
Hope this is not true (that is just a transient problem) but probably is true and Microsoft killed the old skype clients :(.
If it is true, there is nothing to do.
-giovanni