Heavy remote queries runs forever

Hi everybody,
I'm usign SQL Developer and SQL Tool to execute remote queries on a Oracle Database. I think i have some problem with my pc 'cause when I try to exceute heavy queries on large tables the query starts but never ends. When I try to stop the query i get the following error message "ORA-12152: TNS:unable to send break message" (Cause: Unable to send break message. Connection probably disconnected). When my associates try to perform same queries, they manage to get results.
May anyone tell me if there's a problem with my PC (i.e.: tcp/ip configuration).
I think I have the same problem when I try to access BPEL Console: sometimes, i don'tmanage to access a tab and i think the problem is that DB connection gets down (time-out problem).
Thanks for your help!

Hello,
You might already know about the error text, I recommend your to look on metalink around this error. If your co-worker able to execute and get results successfully, then its your connection might be handled differently, and get your network admin/dba involved.
Error: ORA 12152
Text: TNS:unable to send break message
Cause: Unable to send break message. Connection probably disconnected.
Action: Re-establish connection. If the error is persistent, turn
n tracing and reexecute the operation.
Something you can try in agreement with your DBA and network admmin
Add SQLNET.EXPIRE_TIME to the database sqlnet.ora file. This is the file located $ORACLE_HOME/network/admin directory or the directory specified by
The EXPIRE_TIME should be set to the highest value possible that is within the firewall idle connection timeout, to limit the amount of network traffic generated. For example if the firewall timeout is 20 minutes set:
SQLNET.EXPIRE_TIME=15
Regards

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