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cannot retrieve emails from gmx.net
Problem reported by Stefan - 4/21/2016 at 11:00 AM
Submitted
Hi,
I have a rather strange problem with my smartermail installation. It's a small private installation with only 4 accounts. The system was running without problems for almost months. One of the accounts retrieves mails from 4 different mail providers (including gmx.net). Everything is fine with this account.
Another account retrieves mails from only 1 gmx.net account. Since a couple of days this retrieval is failing completely. In the popretrieval.log I can find a message saying:
 
19:40:55 [xxx@yyyyy.de] [pop.gmx.net:xxx@gmx.net] Exception: Von der Übertragungsverbindung können keine Daten gelesen werden: Eine bestehende Verbindung wurde softwaregesteuert
durch den Hostcomputer abgebrochen.
   bei System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   bei System.Net.FixedSizeReader.ReadPacket(Byte[] buffer, Int32 offset, Int32 count)
   bei System.Net.Security._SslStream.StartFrameHeader(Byte[] buffer, Int32 offset, Int32 count, AsyncProtocolRequest asyncRequest)
   bei System.Net.Security._SslStream.StartReading(Byte[] buffer, Int32 offset, Int32 count, AsyncProtocolRequest asyncRequest)
   bei System.Net.Security._SslStream.ProcessRead(Byte[] buffer, Int32 offset, Int32 count, AsyncProtocolRequest asyncRequest)
   bei System.Net.Security.SslStream.Read(Byte[] buffer, Int32 offset, Int32 count)
   bei RelayServer.Clients.POP.POP3Client.#2G(UInt32 #Eob)
19:40:55 Finished processing for xxx@yyyyy.de
 
Smartermail is running on Windows Server 2012R2 with all updates installed. I am running smartermail 15.0.5949.
Any Ideas are welcome.
 
Best regards,
Stefan

10 Replies

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Bruce Barnes Replied
They may be blocking clients on port 25. Swithc to 587, which iw manditory per IETF: see .https://www.ietf.org/rfc/rfc2476.txt
Bruce Barnes ChicagoNetTech Inc brucecnt@comcast.net Phonr: (773) 491-9019 Phone: (224) 444-0169 E-Mail and DNS Security Specialist Network Security Specialist Customer Service Portal: https://portal.chicagonettech.com Website: https://www.ChicagoNetTech.com Security Blog: http://networkbastion.blogspot.com/ Web and E-Mail Hosting, E-Mail Security and Consulting
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Stefan Replied
Bruce,

thanks for your answer. But why is one gmx.net account working and the other not? Both were working until 4 or 5 days ago.
gmx uses port 995 for pop3 retrieval.

Stefan
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Stefan Replied
Doesn't anybody know details about the error message, please?
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Paul Blank Replied
Probably stating the obvious here, but have you tried retrieving those same emails with a desktop or mobile client at the same domain and port 995, just to make sure the "mechanism" is OK at that end?
 
 
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Stefan Replied
Thanks Paul
Yes I tried that. Retrieval from an iphone works without problem. That's my temporary workaround.
1
Paul Blank Replied
Google Translate gives me this:
 
"Exception: From the transmission connection, data can not be read: An existing connection was controlled by software canceled by the host computer."
 
Some kind of authentication/protocol change at the gmx.net end, perhaps? Not very helpful, I know.
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Stefan Replied
Update:
Problem is fixed with latest windows update...
 
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Bruce Barnes Replied
Stefan: Great catch on that fix. May I inquire as to the version of SmarterMail you are using? May I also ask what operating system you are running on the server. Thanks - Bruce
Bruce Barnes ChicagoNetTech Inc brucecnt@comcast.net Phonr: (773) 491-9019 Phone: (224) 444-0169 E-Mail and DNS Security Specialist Network Security Specialist Customer Service Portal: https://portal.chicagonettech.com Website: https://www.ChicagoNetTech.com Security Blog: http://networkbastion.blogspot.com/ Web and E-Mail Hosting, E-Mail Security and Consulting
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Stefan Replied
Hi Bruce,

it's Windows 2012R2 and SmarterMail 15.0.5949.
On Windowss all available updates are installed.

Regards
Stefan
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Bruce Barnes Replied
Thanks!
Bruce Barnes ChicagoNetTech Inc brucecnt@comcast.net Phonr: (773) 491-9019 Phone: (224) 444-0169 E-Mail and DNS Security Specialist Network Security Specialist Customer Service Portal: https://portal.chicagonettech.com Website: https://www.ChicagoNetTech.com Security Blog: http://networkbastion.blogspot.com/ Web and E-Mail Hosting, E-Mail Security and Consulting

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