Hi Paul,
you were right, it's seems to be an Oracle IAS issue so I'll try asking at metalink.
These are the logs we are getting.
Tomcat
3 * In-bound request received
3 > GET
http://localhost:8080/gps_test/services/ambitos/context;matrix=3
3 > accept-encoding: gzip, deflate
3 > connection: Keep-Alive
3 > host: localhost:8080
3 > accept-language: es
3 > user-agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; InfoPath.1)
3 > ua-cpu: x86
3 > accept: */*
3 >
Oracle IAS 10.1.3.3
1 * In-bound request received
1 > GET
http://localhost:8888/gps_test/services/ambitos/context
1 > ACCEPT-ENCODING: gzip, deflate
1 > CONNECTION: Keep-Alive
1 > HOST: localhost:8888
1 > ACCEPT-LANGUAGE: es
1 > USER-AGENT: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; InfoPath.1)
1 > UA-CPU: x86
1 > ACCEPT: */*
1 >
Thanks a lot for your help; if I get a solution for Oracle IAS I'll drop a line with it.