I am apologise if this is not write place for my question.

On part of the LAN connected with other LAN by
modem link 33.6.
Everything is OK until transactions grow up capacity of the telephone line.
At this moment my client computer gets
‘EOF communication channel’ error and stops my

My question is what can/should I do when I get message

ORA-3113: "TNS:End of file on communication channel"

In Oracle manual is written that I need to change
re-transmission count in TCP/IP.

By the way, I think this problem is more problem connected with OS than Oracle.
So, if anyone knows how can I do that, please help me.

Sorry on bad English.

Thank you for help.