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Forum Discussion
RBR750 Email Logs
I have an ORBI RBR750, firmware V4.6.5.14 (latest). I have Security setup to send me logs via email every hour. I've been having MS Outlook email issues on my home environment (two laptops, two pho...
Significant new developments and progress (I'm hoping)...
1. Email send errors occurred again immediately after I was away from my PC for two hours. I had NEVER SLEEP set on my power settings, but not on my screen display. My screen went to sleep, and when it awakes which I forgot about, it too requires me to log back into my laptop via Windows 10 "Hello" sign-in functionality. I tried to turn off this Require Sign-in option when my screen awakes but Windows 10 is blocking me from doing so with a message that says "Windows Hello is preventing some options from being shown." (i.e., a separate issue with MS that I am pursuing).
2. I then setup a mobile hotspot on my phone and was able to send email through this hotspot while my wifi IP route was blocked. I set my laptop to go to sleep to see if I could reproduce the email block so as to eliminate the Orbi router from the equation. Two hours later, when I got back on my PC, I was still able to successfully send email. I.e., the problem appears unique to my wifi-router-ISP connection to Comcast.
3. I changed the DNS Server settings to custom on my RBR750 and input the Cloudflare settings 1.1.1.1 / 1.0.0.1. During the hours when I was blocked from sending email (prior to 6:00 PM CST), this change did not resolve the problem which I presume makes sense because it was my public IP address that was being blocked. This also reinforced with me that the block was likely occurring on Comast's end. I posted this finding in my Comcast Support Community thread and finally, finally, the Comcast admin for that site did confirm that they were blocking my IP address and that every day at 12:00 a.m. GMT, the block is removed.
4. At 6:00 pm CST (12:00 am GMT) the block on my address was cleared by Comcast. Then with the Cloudflare DNS Server entries set on my router, I first confirmed that I could successfully send email. This worked. I then let my PC got to sleep for two hours. When it awoke, I WAS STILL ABLE TO SEND EMAIL - NO 0x800CCC0F ERROR!!! I kept my PC powered up all night with Outlook open, the screen went to sleep, and this morning hours after awaking the PC everything is still working correctly (as of 7:57 a.m.). So, subject to giving this more testing time with fingers crossed, IT APPEARS THE PROBLEM WAS WITH THE ISP'S DNS SERVER AND SOMETHING GOING HAYWIRE WITH MY COMCAST CONNECTION/AUTHENTICATION FAILING WHEN MY LAPTOP WENT TO SLEEP. The Cloudflare DNS server does not seem to experience this problem.
For the experts out there, does it make sense that my ISP's DNS Server could cause this problem while Cloudflare's does not?
Thank you for your help. I would have never known about the custom DNS settings were it not for those on this support forum. I will be posting again, hopefully after several days, to confirm that Cloudflare DNS is in fact the solution.
Ya seems odd that this is happening with ISP DNS and not other DNS.
I'd contact the ISP support and tell them about this and see why ISP DNS causes this with your PC.I'd test a different PC if you have one to compare results...
Let us know how this turns out.
hunt68 wrote:
Significant new developments and progress (I'm hoping)...
1. Email send errors occurred again immediately after I was away from my PC for two hours. I had NEVER SLEEP set on my power settings, but not on my screen display. My screen went to sleep, and when it awakes which I forgot about, it too requires me to log back into my laptop via Windows 10 "Hello" sign-in functionality. I tried to turn off this Require Sign-in option when my screen awakes but Windows 10 is blocking me from doing so with a message that says "Windows Hello is preventing some options from being shown." (i.e., a separate issue with MS that I am pursuing).
2. I then setup a mobile hotspot on my phone and was able to send email through this hotspot while my wifi IP route was blocked. I set my laptop to go to sleep to see if I could reproduce the email block so as to eliminate the Orbi router from the equation. Two hours later, when I got back on my PC, I was still able to successfully send email. I.e., the problem appears unique to my wifi-router-ISP connection to Comcast.
3. I changed the DNS Server settings to custom on my RBR750 and input the Cloudflare settings 1.1.1.1 / 1.0.0.1. During the hours when I was blocked from sending email (prior to 6:00 PM CST), this change did not resolve the problem which I presume makes sense because it was my public IP address that was being blocked. This also reinforced with me that the block was likely occurring on Comast's end. I posted this finding in my Comcast Support Community thread and finally, finally, the Comcast admin for that site did confirm that they were blocking my IP address and that every day at 12:00 a.m. GMT, the block is removed.
4. At 6:00 pm CST (12:00 am GMT) the block on my address was cleared by Comcast. Then with the Cloudflare DNS Server entries set on my router, I first confirmed that I could successfully send email. This worked. I then let my PC got to sleep for two hours. When it awoke, I WAS STILL ABLE TO SEND EMAIL - NO 0x800CCC0F ERROR!!! I kept my PC powered up all night with Outlook open, the screen went to sleep, and this morning hours after awaking the PC everything is still working correctly (as of 7:57 a.m.). So, subject to giving this more testing time with fingers crossed, IT APPEARS THE PROBLEM WAS WITH THE ISP'S DNS SERVER AND SOMETHING GOING HAYWIRE WITH MY COMCAST CONNECTION/AUTHENTICATION FAILING WHEN MY LAPTOP WENT TO SLEEP. The Cloudflare DNS server does not seem to experience this problem.
For the experts out there, does it make sense that my ISP's DNS Server could cause this problem while Cloudflare's does not?
Thank you for your help. I would have never known about the custom DNS settings were it not for those on this support forum. I will be posting again, hopefully after several days, to confirm that Cloudflare DNS is in fact the solution.
Since my last posting on 12/24, I have not had a single email send error (i.e., everything is working as it should). What is odd, however, is that on 12/28, I switched my router settings back from Cloudflares' DNS IP addresses to my ISP's default settings to see if the email send errors would return so as to confirm this was in fact the issue. The send errors did not return. I have kept my router settings to the ISP's original default DNS IP settings since 12/28 and have yet to see the email send errors return.
I am not sure what this means. I've had many communications with Comcast and my ISP since my issues began. Perhaps one of them finally made some changes to correct whatever was causing my problem and has not bothered to tell me because they both swore up and down the issue was not on their end. Maybe the change was account specific as I have seen others post on my Comcast Community Support posting that they continue to experience the same issue. I checked my Windows 10 update history on my laptop and have not had any updates to my system since 12/24 (i.e., I don't think the fix has anything to do with my PC). Nonetheless, I am no longer experiencing email send errors and I am continuing to leave my DNS settings set to my ISP's.
If the errors return, I will post again indicating so.
Interesting that using custome DNS seems to caus the problem while using ISP DNS doesn't. Not sure if this is a Custom DNS issue or handling of the email configuration thru custom DNS which doesn't seem to be a problem if using ISP DNS.
Might try using Google DNS or Quad 9 DNS and see if the problem returns.
Be sure to save off a back up configuration to file for safe keeping. Saves time if a reset is needed.
https://kb.netgear.com/000062080/How-do-I-back-up-the-configuration-settings-on-my-Orbi-WiFi-SystemAlso new FW is out if your so inclined to try it:
