Outlook sending error 0x800ccc1a sporadic and annoying

%3CLINGO-SUB%20id%3D%22lingo-sub-1269143%22%20slang%3D%22en-US%22%3EOutlook%20sending%20error%200x800ccc1a%20sporadic%20and%20annoying%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-1269143%22%20slang%3D%22en-US%22%3E%3CP%3EGood%20Day%2C%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EI'm%20really%20struggling%20with%20this%20at%20the%20office.%20It%20seems%20that%20only%20in%20Outlook%20365%20on%20LAN%20PCs%20that%20sometimes%20email%20sending%20isn't%20working%20and%20messages%20are%20getting%20stuck%20in%20the%20outbox%20with%20the%20error%200x800ccc1a%20(your%20server%20does%20not%20support%20the%20encryption%20type%20specified..).%20This%20happens%20all%20at%20the%20same%20time%20for%20all%20Outlook%20users.%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EWe%20receive%20emails%20just%20fine..%20but%20the%20funny%20part%20is%2C%20is%20that%20if%20we%20wait%20say%2030min%20or%20so%20it%20will%20work%20again%20and%20the%20outbox%20will%20clear%20out.%20The%20encryption%20error%20goes%20away.%20During%20this%20period%2C%20all%20of%20our%20phones%20with%20Outlook%20and%20the%20same%20server%20settings%20on%20office%20wifi%20can%20send%20just%20fine%20through%20the%20same%20ports%2Fencryption.%20And%20a%20period%20of%20time%20passes%20and%20the%20encryption%20error%20to%20the%20server%20comes%20up%20again.%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EI've%20tried%20just%20about%20every%20solution%20I%20can%20find%20online%20(and%20had%20to%20undo%20a%20few%20as%20it%20was%20so%20many%20different%20things%20it%20was%20overwhelming%20and%20have%20to%20backtrack).%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EThe%20only%20thing%20I%20haven't%20had%20the%20opportunity%20to%20do%20so%20far%20is%20power%20cycle%20or%20reboot%20the%20Firewall%2FRouter%20and%20that%20is%20my%20next%20step.%20ISP%20Fibre%20modem%20has%20been%20rebooted.%20It's%20difficultly%20finding%20the%20time%20to%20do%20this%20with%20so%20many%20of%20staff%20remoting%20in%20during%20COVID19...%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EAny%20solutions%20would%20be%20greatly%20appreciated.%20I've%20probably%20tried%20all%20of%20the%20bog%20standard%20ones%20you%20can%20find%20in%20the%20top%2030%20results%20on%20Google%20and%20forums%20again%20other%20than%20resetting%20the%20Firewall%2FRouter.%20There%20doesn't%20appear%20to%20be%20any%20issues%20with%20virus%20protection%2Fsoftware%20updates%2Fsoftware%20firewall.%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EThanks%2C%3CBR%20%2F%3ENathan%3C%2FP%3E%3C%2FLINGO-BODY%3E
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New Contributor

Good Day,

 

I'm really struggling with this at the office. It seems that only in Outlook 365 on LAN PCs that sometimes email sending isn't working and messages are getting stuck in the outbox with the error 0x800ccc1a (your server does not support the encryption type specified..). This happens all at the same time for all Outlook users.

 

We receive emails just fine.. but the funny part is, is that if we wait say 30min or so it will work again and the outbox will clear out. The encryption error goes away. During this period, all of our phones with Outlook and the same server settings on office wifi can send just fine through the same ports/encryption. And a period of time passes and the encryption error to the server comes up again.

 

I've tried just about every solution I can find online (and had to undo a few as it was so many different things it was overwhelming and have to backtrack).

 

The only thing I haven't had the opportunity to do so far is power cycle or reboot the Firewall/Router and that is my next step. ISP Fibre modem has been rebooted. It's difficultly finding the time to do this with so many of staff remoting in during COVID19...

 

Any solutions would be greatly appreciated. I've probably tried all of the bog standard ones you can find in the top 30 results on Google and forums again other than resetting the Firewall/Router. There doesn't appear to be any issues with virus protection/software updates/software firewall.

 

Thanks,
Nathan

1 Reply
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Just a quick update on this.. the cycle of the Firewall/Router and Modem didn't seem to work as the issue has re-emerged this morning. I'm wondering if it's possible if one of our office PCs is causing the issue for everyone.. stuck update, something configured in their Outlook. The only next solution I can think of is a good cold boot of all the PCs as well.

 

So frustrating..