nginx 504 Gateway Time-out when tracerouting

[adamw]

2.4.5-RELEASE-p1 on SG-3100

/diag_traceroute.php

My parameters:

Hostname: mailx.anu.ac.kr
IP Protocol: IPv4
Source Address: Any
Maximum number of hops: 50 (works with 30 or less)
Reverse Address Lookup: Off
User ICMP: Off

Web server timeout error occurs after 180s.

Shouldn't it be handled better?