B4J Question Hello from Palo Alto Networks

[Declan]

I have a B4j TCP app running on my server which runs great and I receive data (2 Bytes) from remote devices on a given port.
However, at least once a day I receive the following on the port:

User-Agent: Hello from Palo Alto Networks, find out more about our scans in https://docs-cortex.paloaltonetworks.com/r/1/Cortex-Xpanse/Scanning-activity
Accept-Encoding: gzip

This creates the following error:

(StringIndexOutOfBoundsException) java.lang.StringIndexOutOfBoundsException: Range [-1, 0) out of bounds for length 219

How can I prevent this?

 

[Daestrum]

Could you not just check the remote IP address and ignore if from Cortex - they have listed the address to ignore here ignore these

 

[Declan]

Could you not just check the remote IP address and ignore if from Cortex - they have listed the address to ignore here ignore these

How would I do this?
I am not a Windows server expert

 

[DonManfred]

How can I prevent this?

Hard to guess anything if you totally hide your code.

I would check the length of data given to be sure not to raise an StringIndexOutOfBoundsException

Learning coding may also help

 

[Declan]

Could you not just check the remote IP address and ignore if from Cortex - they have listed the address to ignore here ignore these

Many thanks, that was the solution