I removed Pingomatic from the list and the error occured on the first site in the list, blo.gs:

Sending XML-RPC ping to host ping.blo.gs...Permission denied
Notice: Permission denied in /home/u2/alphap/html/cblog/bundled-libs/PEAR.php on line 848
Permission denied

My site is hosted at aplus.net ...

I added the announce entries plugin and get this error with a new post.

Sending XML-RPC ping to host rpc.pingomatic.com...Permission denied
Notice: Permission denied in /home/u2/alphap/html/cblog/bundled-libs/PEAR.php on line 848
Permission denied

Pingomatic is the first site in the list. How can ...