I found these logs for the error:
Access Nginx
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177.13.35.4 - - [11/Feb/2017:14:54:32 +0000] "POST /iredadmin/create/user/ideacorp.com.br HTTP/1.1" 303 5 "https://srv-mx2.ideacorp.com.br/iredadm … orp.com.br" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36"
177.13.35.4 - - [11/Feb/2017:14:54:32 +0000] "GET /iredadmin/create/user/?msg=INVALID_DOMAIN_NAME HTTP/1.1" 303 5 "https://srv-mx2.ideacorp.com.br/iredadm … orp.com.br" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36"
177.13.35.4 - - [11/Feb/2017:14:54:32 +0000] "GET /iredadmin/create/user HTTP/1.1" 303 5 "https://srv-mx2.ideacorp.com.br/iredadm … orp.com.br" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36"
177.13.35.4 - - [11/Feb/2017:14:54:32 +0000] "GET /iredadmin/domains?msg=NO_DOMAIN_AVAILABLE HTTP/1.1" 200 3416 "https://srv-mx2.ideacorp.com.br/iredadm … orp.com.br" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36"
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IREDADMIN Log
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root@srv-mx2:/# tail -f /var/log/uwsgi/app/iredadmin.log
srv-mx2.ideacorp.com.br [pid: 26639|app: 0|req: 56/93] 177.13.35.4 () {56 vars in 1292 bytes} [Sat Feb 11 15:07:55 2017] GET /iredadmin/create/user/?msg=INVALID_DOMAIN_NAME => generated 0 bytes in 7 msecs (HTTP/1.1 303) 3 headers in 208 bytes (2 switches on core 0)
srv-mx2.ideacorp.com.br [pid: 26639|app: 0|req: 57/94] 177.13.35.4 () {56 vars in 1243 bytes} [Sat Feb 11 15:07:56 2017] GET /iredadmin/create/user => generated 0 bytes in 7 msecs (HTTP/1.1 303) 3 headers in 228 bytes (3 switches on core 0)
srv-mx2.ideacorp.com.br [pid: 26638|app: 0|req: 38/95] 177.13.35.4 () {56 vars in 1282 bytes} [Sat Feb 11 15:07:56 2017] GET /iredadmin/domains?msg=NO_DOMAIN_AVAILABLE => generated 13925 bytes in 413 msecs (HTTP/1.1 200) 2 headers in 136 bytes (3 switches on core 0)
srv-mx2.ideacorp.com.br [pid: 26639|app: 0|req: 58/96] 177.13.35.4 () {54 vars in 1275 bytes} [Sat Feb 11 15:09:57 2017] GET /iredadmin/profile/domain/general/ampereimoveis.com.br => generated 9563 bytes in 398 msecs (HTTP/1.1 200) 2 headers in 136 bytes (2 switches on core 0)
srv-mx2.ideacorp.com.br [pid: 26638|app: 0|req: 39/97] 177.13.35.4 () {54 vars in 1253 bytes} [Sat Feb 11 15:10:00 2017] GET /iredadmin/users/ampereimoveis.com.br => generated 13044 bytes in 408 msecs (HTTP/1.1 200) 2 headers in 136 bytes (2 switches on core 0)
srv-mx2.ideacorp.com.br [pid: 26639|app: 0|req: 59/98] 177.13.35.4 () {54 vars in 1248 bytes} [Sat Feb 11 15:10:03 2017] GET /iredadmin/create/user/ampereimoveis.com.br => generated 10671 bytes in 391 msecs (HTTP/1.1 200) 2 headers in 136 bytes (2 switches on core 0)
srv-mx2.ideacorp.com.br [pid: 26638|app: 0|req: 40/99] 177.13.35.4 () {62 vars in 1442 bytes} [Sat Feb 11 15:10:16 2017] POST /iredadmin/create/user/ampereimoveis.com.br => generated 0 bytes in 11 msecs (HTTP/1.1 303) 3 headers in 233 bytes (2 switches on core 0)
srv-mx2.ideacorp.com.br [pid: 26638|app: 0|req: 41/100] 177.13.35.4 () {56 vars in 1292 bytes} [Sat Feb 11 15:10:16 2017] GET /iredadmin/create/user/?msg=INVALID_DOMAIN_NAME => generated 0 bytes in 5 msecs (HTTP/1.1 303) 3 headers in 208 bytes (2 switches on core 0)
srv-mx2.ideacorp.com.br [pid: 26639|app: 0|req: 60/101] 177.13.35.4 () {56 vars in 1243 bytes} [Sat Feb 11 15:10:16 2017] GET /iredadmin/create/user => generated 0 bytes in 10 msecs (HTTP/1.1 303) 3 headers in 228 bytes (2 switches on core 0)
srv-mx2.ideacorp.com.br [pid: 26639|app: 0|req: 61/102] 177.13.35.4 () {56 vars in 1282 bytes} [Sat Feb 11 15:10:16 2017] GET /iredadmin/domains?msg=NO_DOMAIN_AVAILABLE => generated 13925 bytes in 420 msecs (HTTP/1.1 200) 2 headers in 136 bytes (2 switches on core 0)
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