I just started using carrot2 directly today (I have previous experience using it as part of @note2).
I am able to search the web and Wikipedia through either http://search.carrot2.org or the workbench application.
When searching the pubmed source, I get the following errors:
java.net.SocketTimeoutException: Read timed out
org.apache.http.conn.ConnectTimeoutException: Connect to eutils.ncbi.nlm.nih.gov/eutils.ncbi.nlm.nih.gov/130.14.29.110 timed out
Could they be transient or version dependent? Is anyone else successfully searching and clustering pubmed records with carrot2?
Based on input from Dawid Weiss and Jack Park at http://sourceforge.net/p/carrot2/mailman/message/33066121/
NCBI puts various limitations on pubmed queries through http://eutils.ncbi.nlm.nih.gov/entrez/eutils/
They include time-of-day and per-IP limitations. See http://www.ncbi.nlm.nih.gov/books/NBK25497/