NRDP communication problem

[mroter]

Using Nagios XI 3.2
I have a machine ("A") in SIN that send check results over NRDP to ILS ("B") & UK ("C")
I have a machine ("D") in UK that send check results over NRDP to ("C") in UK (no FW)
When "D" (or "C") are sending to "B" through the ILS FW I get blocked by the FW (probably due to wrong Content-Type). Please see the attached files.
Looks like "A" is sending

Content-Type: text/xml

which is the correct type and therefore passes the FW while "D" and "C" are sending

Content-Type: text/html

and are block by the FW.
I've tried both send_nrdp.sh and send_nrdp.php clients with the same results...

Please help

[scottwilkerson]

The Content-Type you are seeing is what is being returned.

The failed item is getting a message returned from IRONmaiden and that is what is returning the text/html not the NRDP server.

I would check that the machine that are failing are allowed access through the firewall

[mroter]

Thanks - we found and solved the problem in the FW.