Thanks for the answer Tim.
I have 2 applications, wayback and nutchwax, they belong to a search server.
*Nutchwax -> Index -> User
*Wayback -> *Nutchwax -> Index -> User
*Wayback -> *Nutchwax -> Index -> *ArcProxy -> *Browser -> User
* means that this is a application of tomcat
The fact is when I configure Tomcat to have 100 MaxThreads and then I make 100 simultaneous requests to Wayback the threads stop responding, keeps waiting for the arcproxy application, this application doesn't have any free thread to use.
Thanks in advance for the help.