Test e-mail failed; SMTP configuration error on Smart-UPS 5000 with NMC2

[robbiethek]

We have a Smart-UPS 5000 and can't get the email notifications to go out. We have a Linux mail server running Postifx that is in the same subnet so I tried setting the SMTP Server IP and tried both ports 25 and 587. When testing I always get:

Last Test Result
(email redacted) Test e-mail failed; SMTP configuration error.
Last Server Response
No data.

I've read the troubleshooting article, as well as this related thread and this one. What else can I check? I made sure firewalld allows the Smart-UPS IP address as well as ports 25 and 587. I tried posting a full tcpdump but it got labeled as the word that rhymes with ham.

192.168.1.11. is the mail server and 192.168.1.231 is the Smart UPS 5000. Some examples from tcpdump:

14:05:56.543855 IP 192.168.1.11.54530 > 192.168.1.231.http: Flags [S], seq 1935784362, win 29200, options [mss 1460,sackOK,TS val 4103350040 ecr 0,nop,wscale 7], length 0

14:05:56.546389 IP 192.168.1.231.http > 192.168.1.11.54530: Flags [S.], seq 1709129928, ack 1935784363, win 4380, options [mss 1460,nop,wscale 0,nop,nop,sackOK], length 0

14:05:56.546404 IP 192.168.1.11.54530 > 192.168.1.231.http: Flags [.], ack 1, win 229, length 0

14:05:56.546454 IP 192.168.1.11.54530 > 192.168.1.231.http: Flags [P.], seq 1:594, ack 1, win 229, length 593: HTTP: POST /NMC/kBoNgel0R0JdgRZndCLrMg/Forms/emtest1 HTTP/1.1

14:05:57.097070 IP 192.168.1.11 > 192.168.1.231: ICMP host 192.168.1.11 unreachable - admin prohibited, length 60

14:05:57.147846 IP 192.168.1.11.54530 > 192.168.1.231.http: Flags [P.], seq 594:1086, ack 413, win 237, length 492: HTTP: GET /NMC/kBoNgel0R0JdgRZndCLrMg/emtest.htm HTTP/1.1
14:05:57.190049 IP 192.168.1.231.http > 192.168.1.11.54530: Flags [P.], seq 413:867, ack 1086, win 3295, length 454: HTTP: HTTP/1.1 200 OK

14:05:58.076116 IP 192.168.1.231.puppet > 192.168.1.11.submission: Flags [S], seq 2919252718, win 4380, options [mss 1460,nop,wscale 0,nop,nop,sackOK], length 0
14:05:58.076230 IP 192.168.1.11 > 192.168.1.231: ICMP host 192.168.1.11 unreachable - admin prohibited, length 60

14:06:00.076497 IP 192.168.1.231.puppet > 192.168.1.11.submission: Flags [S], seq 2919252718, win 4380, options [mss 1460,nop,wscale 0,nop,nop,sackOK], length 0
14:06:00.076545 IP 192.168.1.11 > 192.168.1.231: ICMP host 192.168.1.11 unreachable - admin prohibited, length 60

14:06:04.076324 IP 192.168.1.231.puppet > 192.168.1.11.submission: Flags [S], seq 2919252718, win 4380, options [mss 1460,nop,wscale 0,nop,nop,sackOK], length 0

[robbiethek]

Last Test Result
(email redacted) Test e-mail failed; SMTP configuration error.
Last Server Response
No data.

I've read the troubleshooting article, as well as this related thread and this one. What else can I check? I made sure firewalld allows the Smart-UPS IP address as well as ports 25 and 587. I tried posting a full tcpdump but it got labeled as the word that rhymes with ham.

192.168.1.11. is the mail server and 192.168.1.231 is the Smart UPS 5000. Some examples from tcpdump:

14:05:56.543855 IP 192.168.1.11.54530 > 192.168.1.231.http: Flags [S], seq 1935784362, win 29200, options [mss 1460,sackOK,TS val 4103350040 ecr 0,nop,wscale 7], length 0

14:05:56.546389 IP 192.168.1.231.http > 192.168.1.11.54530: Flags [S.], seq 1709129928, ack 1935784363, win 4380, options [mss 1460,nop,wscale 0,nop,nop,sackOK], length 0

14:05:56.546404 IP 192.168.1.11.54530 > 192.168.1.231.http: Flags [.], ack 1, win 229, length 0

14:05:56.546454 IP 192.168.1.11.54530 > 192.168.1.231.http: Flags [P.], seq 1:594, ack 1, win 229, length 593: HTTP: POST /NMC/kBoNgel0R0JdgRZndCLrMg/Forms/emtest1 HTTP/1.1

14:05:57.097070 IP 192.168.1.11 > 192.168.1.231: ICMP host 192.168.1.11 unreachable - admin prohibited, length 60

14:05:57.147846 IP 192.168.1.11.54530 > 192.168.1.231.http: Flags [P.], seq 594:1086, ack 413, win 237, length 492: HTTP: GET /NMC/kBoNgel0R0JdgRZndCLrMg/emtest.htm HTTP/1.1
14:05:57.190049 IP 192.168.1.231.http > 192.168.1.11.54530: Flags [P.], seq 413:867, ack 1086, win 3295, length 454: HTTP: HTTP/1.1 200 OK

14:05:58.076116 IP 192.168.1.231.puppet > 192.168.1.11.submission: Flags [S], seq 2919252718, win 4380, options [mss 1460,nop,wscale 0,nop,nop,sackOK], length 0
14:05:58.076230 IP 192.168.1.11 > 192.168.1.231: ICMP host 192.168.1.11 unreachable - admin prohibited, length 60

14:06:00.076497 IP 192.168.1.231.puppet > 192.168.1.11.submission: Flags [S], seq 2919252718, win 4380, options [mss 1460,nop,wscale 0,nop,nop,sackOK], length 0
14:06:00.076545 IP 192.168.1.11 > 192.168.1.231: ICMP host 192.168.1.11 unreachable - admin prohibited, length 60

14:06:04.076324 IP 192.168.1.231.puppet > 192.168.1.11.submission: Flags [S], seq 2919252718, win 4380, options [mss 1460,nop,wscale 0,nop,nop,sackOK], length 0

[Teken]

What firmware is the NMC 2 running?!? If you’re still on 5.XX / 6.XX firmware you need to upgrade to v7.1.8.

Show me the SMTP Server settings and a screen capture of the About tab for the NMC.

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