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Forum Discussion
RBK50 DNS errors when sending to SMTP server
Latest firmware 2.7.4.24. When sending from Outlook or iOS clients, cannot send, error AUP-CXDNS. Shutting off wireless circumvents the issue. Any DNS setting in the ORBI that might correct this? Tha...
Have not changed from the defaults, so:
No Logon required
IP address assignment and DNS settings coming automatically from ISP, two DNS servers provided by my ISP
Default Router MAC address
No DHCP options
No VLAN ID specifications
No Dynamic DNS settings
I will add that errors occur whether connected via ethernet or WiFi.
For a test, please try to select “Use These DNS Servers” and set the dns servers to primary 1.1.1.1 and secondary 8.8.8.8 then click on Apply
Will do, though since that would impact the household working from home, it will be (much) later today. Thanks.
Same failures when using the alternative DNS servers suggested. Now pursuing this as an issue with my ISP, which at the moment is a different ISP than my email provider.
Thanks for the help, and I'll share more later whether fixed or not.
Perhaps I read the conversation incorrectly. It appears that post #4
"email works normally when not connected to WiFi makes it hard (not impossible) to blame them"
is inconsistent with post #5
I will add that errors occur whether connected via ethernet or WiFi.
I found one comment that this condition was remedied by the ISP creating a PTR (whatever the heck THAT is)
(see post #2 on this conversation: https://www.reddit.com/r/CoxCommunications/comments/vs759s/smtp_outbound_server_from_outlook_when_not_on_cox/)
The sense that I get when looking up CXDNS under Cox on this website: https://mxtoolbox.com/Bouncebacks is that Cox is attempting to perform a Reverse DNS Lookup on the IP address that is attempting to connect to the SMTP server and not finding a PTR record.
When I input my public IP address into this DNS Reverse Lookup Site, this is what it shows:
cpe-xxx-xxx-112-236.socal.res.rr.com
What happens when you enter your public IP address into the tool?
https://mxtoolbox.com/ReverseLookup.aspx
