Symptoms

• Scan attempt against a remote machine using Protect fails with the following error.

Error 235: System not found, or NetBIOS ports may be firewalled

Cause

This issue occurs if a machine with the specified IP address does not exist. If a machine does exist at this address, a personal firewall or port filtering device may be dropping packets destined for TCP ports 139 and 445.

Resolution

To resolve this issue:

1. Ensure that a machine actually exists at the specified name or IP address. To verify this, use a command prompt to ping the machine.
2. Ensure that you can remotely connect to the target system(s) over ports 139 and/or 445. To verify this, you can use the telnet command or any other method.
   
   For example, you can use a telnet command similar to:
   
   telnetmymachine 139
   
   Note: The telnet client may not be installed by default on newer Windows operating systems. You may need to add it through Windows features to use the telnet command.
3. Ensure that there is no DNS resolution issue. To verify this, open a command prompt on the Protect console machine and perform a forward and reverse nslookup of the target system.
   
   For example:
   
   nslookup machinename
   nslookup 0.0.0.0
   The results should match.
   
   If the machine cannot be properly resolved, contact your network administrator.

Affected Product(s)

Shavlik Protect 9.x