If an attacker had reconfigured it to use a different port , the IDS may not be able to detect the presence of the trojan .
For example , an IDS may expect to detect a trojan on port 12345 .
If an attacker had reconfigured IDS to use a different port , the IDS may not be able to detect the presence of the trojan .
For example , an IDS may expect to detect a trojan on port 12345 .