error connecting to baikal caldav and carddav over ssl (https) using dyndns

Connecting with emClient to Baikal Server fails:

The Server-URL:

    https://mydns.dyndns.info:44444/baikal/cal.php/calendars/user/

fails. but

    https://88.65.23.12:44444/baikal/cal.php/calendars/user/
    where 88.65.23.12 is the external ip address
   
works.

In details:

Working with emClient6 and WIn7:

I try to connect to a baikal Server.  The Baikal works fine with iOS and OSX Apps.
For a Windows-Mashine I tried emClient.

Access with the local IP works, with the external public ip-address of the router it works also.
But when I replace the IP by the hostname the procedure fails.

When i execute ping with the dns name it resolves properly.
When i connect with a browser to the admin page by using
    https://88.65.23.12:44444/baikal/admin
 it works.

When i use the external IP a certificate - error raises. But this is OK, because i use DynDns and the certificate is issued for local IP and external dnydns address. In this case a accept the warning and choice “connect” and it works.

When I use the dyndns name in the Server-URL, an error popup window is shown: The Log in the pop-up window:

16:31:09 caldavtester [CalDAV / CardDAV]  MailExceptions.ConnectionException: Die zugrunde liegende Verbindung wurde geschlossen: Unerwarteter Fehler beim Senden… —> System.Net.WebException: Die zugrunde liegende Verbindung wurde geschlossen: Unerwarteter Fehler beim Senden… —> System.IO.IOException: Unerwartetes Dateiende oder 0 Bytes vom Transportstream erhalten.
16:31:09    bei System.Net.TlsStream.EndWrite(IAsyncResult asyncResult)
16:31:09    bei System.Net.PooledStream.EndWrite(IAsyncResult asyncResult)
16:31:09    bei System.Net.ConnectStream.WriteHeadersCallback(IAsyncResult ar)
16:31:09    — Ende der internen Ausnahmestapel ̧berwachung —
16:31:09    bei System.Net.HttpWebRequest.EndGetRequestStream(IAsyncResult asyncResult, TransportContext& context)
16:31:09    bei System.Net.HttpWebRequest.EndGetRequestStream(IAsyncResult asyncResult)
16:31:09    bei MailClient.CalDav.ProtocolCommands.RequestCommand.Execute(HttpWebRequest httpRequest, CancellationToken cancellationToken, Action`1 logBody)
16:31:09    bei MailClient.CalDav.ProtocolCommands.Connector.RunCommand(CalDavAccount account, ICommand command, CancellationToken cancellationToken)
16:31:09    — Ende der internen Ausnahmestapel ̧berwachung —
16:31:09    bei MailClient.CalDav.ProtocolCommands.Connector.RunCommand(CalDavAccount account, ICommand command, CancellationToken cancellationToken)
16:31:09    bei MailClient.CalDav.Synchronizer.BootstrapCommand.UpdateOptions(Uri[] baseUris)
16:31:09    bei MailClient.CalDav.Synchronizer.BootstrapCommand.Execute(WorkerStatus status)
16:31:09    bei MailClient.Commands.Command.Process(WorkerStatus status)

The CALDAV log shows only:
16:31:09.107|013|   C: OptionsCommand https://mydns.dyndns.info:44444/baikal/cal.php/calendars/user/
 
In a second version i worked with a system without proper ssl certificate, but the result was the same.

The ip log (version without certificate) could by find at the end.

remark: Port Number, DNS Name and DNS related hex dump are changed

With regards
    heribert

— IP log ------
… means lines left out
IP, dans values are changed


16:36:46.791|00D|   System.Net Verbose: 0 : [3016] WebRequest::Create(https://mydns.dyndns.info:44444/baikal/cal.php/calendars/tester/)
16:36:46.791|00D|   System.Net Verbose: 0 : [3016] HttpWebRequest#64912252::HttpWebRequest(https://mydns.dyndns.info:44444/baikal/cal.php/calendars/tester/#-276060221)
16:36:46.791|00D|   System.Net Verbose: 0 : [3016] Exiting HttpWebRequest#64912252::HttpWebRequest()
16:36:46.791|00D|   System.Net Verbose: 0 : [3016] Exiting WebRequest::Create() -> HttpWebRequest#64912252
16:36:47.260|00D|   System.Net Verbose: 0 : [3016] HttpWebRequest#64912252::BeginGetRequestStream()
16:36:47.260|00D|   System.Net Information: 0 : [3016] Associating HttpWebRequest#64912252 with ServicePoint#9010854
16:36:47.291|00D|   System.Net Information: 0 : [3016] Associating Connection#43856670 with HttpWebRequest#64912252
16:36:47.291|00D|   System.Net.Sockets Verbose: 0 : [3016] Socket#16802227::Socket(InterNetwork#2)
16:36:47.291|00D|   System.Net.Sockets Verbose: 0 : [3016] Exiting Socket#16802227::Socket()
16:36:47.291|00D|   System.Net.Sockets Verbose: 0 : [3016] Socket#18202863::Socket(InterNetworkV6#23)
16:36:47.291|00D|   System.Net.Sockets Verbose: 0 : [3016] Exiting Socket#18202863::Socket()
16:36:47.479|00D|   System.Net Verbose: 0 : [3016] Exiting HttpWebRequest#64912252::BeginGetRequestStream() -> ContextAwareResult#30930259
16:36:47.635|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#16802227::EndConnect(ConnectAsyncResult#2715132)
16:36:47.635|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#16802227::EndConnect()
16:36:47.635|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#18202863::Close()
16:36:47.635|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#18202863::Dispose()
16:36:47.635|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#18202863::Close()
16:36:47.666|003|   System.Net Information: 0 : [2080] TlsStream#46157251::.ctor(host=mydns.dyndns.info, #certs=0)
16:36:47.666|003|   System.Net Information: 0 : [2080] Associating HttpWebRequest#64912252 with ConnectStream#46475770
16:36:47.666|003|   System.Net Information: 0 : [2080] HttpWebRequest#64912252 - Request: OPTIONS /baikal/cal.php/calendars/tester/ HTTP/1.1
16:36:47.666|003|  
16:36:47.791|003|   System.Net Information: 0 : [2080] SecureChannel#51890598::.ctor(hostname=mydns.dyndns.info, #clientCertificates=0)
16:36:47.885|003|   System.Net Information: 0 : [2080] Sicherheitspakete werden enumeriert:
16:36:47.885|003|   System.Net Information: 0 : [2080]     Negotiate
16:36:47.885|003|   System.Net Information: 0 : [2080]     NegoExtender
16:36:47.885|003|   System.Net Information: 0 : [2080]     Kerberos
16:36:47.885|003|   System.Net Information: 0 : [2080]     NTLM
16:36:47.885|003|   System.Net Information: 0 : [2080]     Schannel
16:36:47.885|003|   System.Net Information: 0 : [2080]     Microsoft Unified Security Protocol Provider
16:36:47.885|003|   System.Net Information: 0 : [2080]     WDigest
16:36:47.885|003|   System.Net Information: 0 : [2080]     TSSSP
16:36:47.885|003|   System.Net Information: 0 : [2080]     pku2u
16:36:47.885|003|   System.Net Information: 0 : [2080]     CREDSSP
16:36:47.885|003|   System.Net Information: 0 : [2080] SecureChannel#51890598 - Noch 0 Clientzertifikate zum Auswählen verfügbar.
16:36:47.963|003|   System.Net Information: 0 : [2080] AcquireCredentialsHandle(package = Microsoft Unified Security Protocol Provider, intent  = Outbound, scc     = System.Net.SecureCredential)
16:36:48.166|003|   System.Net Information: 0 : [2080] InitializeSecurityContext(credential = System.Net.SafeFreeCredential_SECURITY, context = (null), targetName = mydns.dyndns.info, inFlags = ReplayDetect, SequenceDetect, Confidentiality, AllocateMemory, InitManualCredValidation)
16:36:48.198|003|   System.Net Information: 0 : [2080] InitializeSecurityContext(Länge von In-Buffer = 0, Länge von Out-Buffer = 123, zurückgegebener Code = ContinueNeeded).
16:36:48.198|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#16802227::BeginSend()
16:36:48.526|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#16802227::BeginSend() -> OverlappedAsyncResult#9724938
16:36:48.526|003|   System.Net Information: 0 : [2080] ConnectStream#46475770 - Header
{
User-Agent: eM Client/6.0.21040.0
16:36:48.526|003|   Accept-Encoding: gzip, deflate,gzip, deflate
16:36:48.526|003|   Host: mydns.dyndns.info:44444
16:36:48.526|003|   Content-Length: 0
16:36:48.526|003|   Connection: Keep-Alive
16:36:48.526|003|   } werden gesendet.
16:36:48.526|003|   System.Net.Sockets Verbose: 0 : [2080] Data from Socket#16802227::PostCompletion
16:36:48.526|003|   System.Net.Sockets Verbose: 0 : [2080] 00000000 : 16 03 01 00 76 01 00 00-72 03 01 54 88 E7 20 CA : …v…r…T… .
16:36:48.526|003|   System.Net.Sockets Verbose: 0 : [2080] 00000010 : 28 18 70 5B 02 53 6B E8-DF 91 C2 61 4C 72 61 8B : (.p[.Sk…aLra.
16:36:48.526|003|   System.Net.Sockets Verbose: 0 : [2080] 00000020 : B6 98 79 F9 30 07 D1 C8-54 AF 0A 00 00 18 C0 14 : …y.0…T…
16:36:48.526|003|   System.Net.Sockets Verbose: 0 : [2080] 00000030 : C0 13 C0 0A C0 09 00 35-00 2F 00 38 00 32 00 0A : …5./.8.2…
16:36:48.526|003|   System.Net.Sockets Verbose: 0 : [2080] 00000040 : 00 13 00 05 00 04 01 00-00 31 FF 01 00 01 00 00 : …1…
16:36:48.526|003|   System.Net.Sockets Verbose: 0 : [2080] 00000050 : 00 00 16 00 14 00 00 11-6D 00 00 00 00 2E 64 79 : …mydns.dy
16:36:48.526|003|   System.Net.Sockets Verbose: 0 : [2080] 00000060 : 6E 64 6E 73 2E 69 6E 66-6F 00 0A 00 08 00 06 00 : ndns.info…
16:36:48.526|003|   System.Net.Sockets Verbose: 0 : [2080] 00000070 : 19 00 17 00 18 00 0B 00-02 01 00                : …
16:36:48.526|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#16802227::EndSend(OverlappedAsyncResult#9724938)
16:36:48.526|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#16802227::EndSend() -> 123#123
16:36:48.526|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#16802227::BeginReceive()
16:36:48.526|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#16802227::BeginReceive() -> OverlappedAsyncResult#31106218
16:36:48.635|003|   System.Net.Sockets Verbose: 0 : [2080] Data from Socket#16802227::PostCompletion
16:36:48.635|003|   System.Net.Sockets Verbose: 0 : [2080] 00000000 : 15 03 01 00 02                                  : …
16:36:48.635|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#16802227::EndReceive(OverlappedAsyncResult#31106218)
16:36:48.635|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#16802227::EndReceive() -> 5#5
16:36:48.635|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#16802227::BeginReceive()
16:36:48.635|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#16802227::BeginReceive() -> OverlappedAsyncResult#59043658
16:36:48.635|003|   System.Net.Sockets Verbose: 0 : [2080] Data from Socket#16802227::PostCompletion
16:36:48.635|003|   System.Net.Sockets Verbose: 0 : [2080] (printing 1024 out of 1435)
16:36:48.635|003|   System.Net.Sockets Verbose: 0 : [2080] 00000000 : 01 70 16 03 01 00 5D 02-00 00 59 03 01 15 CF 10 : .p…]…Y…
16:36:48.635|003|   System.Net.Sockets Verbose: 0 : [2080] 00000010 : 7A D4 91 2E 9D EA 50 82-3C 5A 33 06 76 3C 70 07 : z…P.<z3.v></z3.v>16:36:48.635|003|   System.Net.Sockets Verbose: 0 : [2080] 00000020 : AC AD 2E 46 8D B9 C7 1D-44 8F CD 61 20 20 EF 21 : …F…D…a  .!

16:36:48.635|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#16802227::EndReceive(OverlappedAsyncResult#59043658)
16:36:48.635|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#16802227::EndReceive() -> 1435#1435
16:36:48.635|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#16802227::BeginReceive()
16:36:48.635|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#16802227::BeginReceive() -> OverlappedAsyncResult#64218094
16:36:58.791|003|   System.Net.Sockets Verbose: 0 : [2080] Data from Socket#16802227::PostCompletion
16:36:58.791|003|   System.Net.Sockets Verbose: 0 : [2080] 00000000 :                                                 :
16:36:58.791|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#16802227::EndReceive(OverlappedAsyncResult#64218094)
16:36:58.791|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#16802227::EndReceive() -> 0#0
16:36:59.229|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#16802227::Dispose()
16:36:59.229|003|   System.Net Error: 0 : [2080] Exception in the HttpWebRequest#64912252:: - Die zugrunde liegende Verbindung wurde geschlossen: Unerwarteter Fehler beim Senden…
16:36:59.260|003|   System.Net Warning: 0 : [2080] ScriptEngine wurde über eine mögliche Änderung der Systemproxyeinstellungen benachrichtigt und aktualisiert die WebProxy-Einstellungen.
16:36:59.916|003|   System.Net Information: 0 : [2080] Associating HttpWebRequest#64912252 with ServicePoint#9010854
16:36:59.916|003|   System.Net Information: 0 : [2080] Associating Connection#17965787 with HttpWebRequest#64912252
16:36:59.932|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#36982932::Socket(InterNetwork#2)
16:36:59.932|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#36982932::Socket()
16:36:59.932|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#24730077::Socket(InterNetworkV6#23)
16:36:59.932|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#24730077::Socket()
16:36:59.932|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#36982932::BeginConnectEx()
16:36:59.932|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#36982932::InternalBind(0:0#0)
16:36:59.932|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#36982932::InternalBind()
16:37:00.088|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#36982932::BeginConnectEx() -> ConnectOverlappedAsyncResult#17758139
16:37:00.088|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#36982932::EndConnect(ConnectOverlappedAsyncResult#17758139)
16:37:00.088|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#36982932::EndConnect()
16:37:00.088|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#24730077::Close()
16:37:00.088|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#24730077::Dispose()
16:37:00.088|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#24730077::Close()
16:37:00.088|003|   System.Net Information: 0 : [2080] TlsStream#33452913::.ctor(host=mydns.dyndns.info, #certs=0)
16:37:00.088|003|   System.Net Information: 0 : [2080] Associating HttpWebRequest#64912252 with ConnectStream#31828611
16:37:00.088|003|   System.Net Information: 0 : [2080] HttpWebRequest#64912252 - Request: OPTIONS /baikal/cal.php/calendars/tester/ HTTP/1.1
16:37:00.088|003|  
16:37:00.088|003|   System.Net Information: 0 : [2080] SecureChannel#4215477::.ctor(hostname=mydns.dyndns.info, #clientCertificates=0)
16:37:00.088|003|   System.Net Information: 0 : [2080] SecureChannel#4215477 - Noch 0 Clientzertifikate zum Auswählen verfügbar.
16:37:00.088|003|   System.Net Information: 0 : [2080] Das zwischengespeicherte Anmeldeinformationshandle wird verwendet.
16:37:00.088|003|   System.Net Information: 0 : [2080] InitializeSecurityContext(credential = System.Net.SafeFreeCredential_SECURITY, context = (null), targetName = mydns.dyndns.info, inFlags = ReplayDetect, SequenceDetect, Confidentiality, AllocateMemory, InitManualCredValidation)
16:37:00.088|003|   System.Net Information: 0 : [2080] InitializeSecurityContext(Länge von In-Buffer = 0, Länge von Out-Buffer = 123, zurückgegebener Code = ContinueNeeded).
16:37:00.088|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#36982932::BeginSend()
16:37:00.088|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#36982932::BeginSend() -> OverlappedAsyncResult#4554251
16:37:00.088|003|   System.Net Information: 0 : [2080] ConnectStream#31828611 - Header
{
User-Agent: eM Client/6.0.21040.0
16:37:00.088|003|   Accept-Encoding: gzip, deflate,gzip, deflate,gzip, deflate
16:37:00.088|003|   Host: mydns.dyndns.info:44444
16:37:00.088|003|   Content-Length: 0
16:37:00.088|003|   Connection: Keep-Alive
16:37:00.088|003|   } werden gesendet.
16:37:00.088|003|   System.Net.Sockets Verbose: 0 : [2080] Data from Socket#36982932::PostCompletion
16:37:00.088|003|   System.Net.Sockets Verbose: 0 : [2080] 00000000 : 16 03 01 00 76 01 00 00-72 03 01 54 88 E7 2C DF : …v…r…T…,.
16:37:00.088|003|   System.Net.Sockets Verbose: 0 : [2080] 00000010 : 05 4D DF 42 D3 EE 18 02-82 26 B2 E0 5B 79 82 DC : .M.B…&…[y…
16:37:00.088|003|   System.Net.Sockets Verbose: 0 : [2080] 00000020 : 5A E8 A2 C1 76 3B 70 B2-B3 0C 39 00 00 18 C0 14 : Z…v;p…9…
16:37:00.088|003|   System.Net.Sockets Verbose: 0 : [2080] 00000030 : C0 13 C0 0A C0 09 00 35-00 2F 00 38 00 32 00 0A : …5./.8.2…
16:37:00.088|003|   System.Net.Sockets Verbose: 0 : [2080] 00000040 : 00 13 00 05 00 04 01 00-00 31 FF 01 00 01 00 00 : …1…
16:37:00.088|003|   System.Net.Sockets Verbose: 0 : [2080] 00000050 : 00 00 16 00 14 00 00 11-6D 00 00 00 00 2E 64 79 : …mydns.dy
16:37:00.088|003|   System.Net.Sockets Verbose: 0 : [2080] 00000060 : 6E 64 6E 73 2E 69 6E 66-6F 00 0A 00 08 00 06 00 : ndns.info…
16:37:00.088|003|   System.Net.Sockets Verbose: 0 : [2080] 00000070 : 19 00 17 00 18 00 0B 00-02 01 00                : …
16:37:00.088|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#36982932::EndSend(OverlappedAsyncResult#4554251)
16:37:00.088|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#36982932::EndSend() -> 123#123
16:37:00.088|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#36982932::BeginReceive()
16:37:00.088|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#36982932::BeginReceive() -> OverlappedAsyncResult#10313418
16:37:00.182|003|   System.Net.Sockets Verbose: 0 : [2080] Data from Socket#36982932::PostCompletion
16:37:00.182|003|   System.Net.Sockets Verbose: 0 : [2080] 00000000 : 15 03 01 00 02                                  : …
16:37:00.182|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#36982932::EndReceive(OverlappedAsyncResult#10313418)
16:37:00.182|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#36982932::EndReceive() -> 5#5
16:37:00.182|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#36982932::BeginReceive()
16:37:00.182|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#36982932::BeginReceive() -> OverlappedAsyncResult#41110389
16:37:00.182|003|   System.Net.Sockets Verbose: 0 : [2080] Data from Socket#36982932::PostCompletion
16:37:00.182|003|   System.Net.Sockets Verbose: 0 : [2080] (printing 1024 out of 1435)
16:37:00.182|003|   System.Net.Sockets Verbose: 0 : [2080] 00000000 : 01 70 16 03 01 00 5D 02-00 00 59 03 01 FD EC EC : .p…]…Y…
16:37:00.182|003|   System.Net.Sockets Verbose: 0 : [2080] 00000010 : 99 26 BC A4 B5 FD 77 21-D0 5B 87 70 EE 30 69 27 : .&…w!.[.p.0i’
16:37:00.182|003|   System.Net.Sockets Verbose: 0 : [2080] 00000020 : 11 4D 39 6B 2B 13 FA 9E-ED 32 74 85 2F 20 42 B3 : .M9k+…2t./ B.

16:37:00.182|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#36982932::EndReceive(OverlappedAsyncResult#41110389)
16:37:00.182|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#36982932::EndReceive() -> 1435#1435
16:37:00.182|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#36982932::BeginReceive()
16:37:00.182|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#36982932::BeginReceive() -> OverlappedAsyncResult#27787984
16:37:10.354|003|   System.Net.Sockets Verbose: 0 : [2080] Data from Socket#36982932::PostCompletion
16:37:10.354|003|   System.Net.Sockets Verbose: 0 : [2080] 00000000 :                                                 :
16:37:10.354|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#36982932::EndReceive(OverlappedAsyncResult#27787984)
16:37:10.354|003|   System.Net.Sockets Verbose: 0 : [2080] Exiting Socket#36982932::EndReceive() -> 0#0
16:37:10.385|003|   System.Net.Sockets Verbose: 0 : [2080] Socket#36982932::Dispose()
16:37:10.385|003|   System.Net Error: 0 : [2080] Exception in the HttpWebRequest#64912252:: - Die zugrunde liegende Verbindung wurde geschlossen: Unerwarteter Fehler beim Senden…
16:37:10.385|00D|   System.Net Verbose: 0 : [3016] HttpWebRequest#64912252::EndGetRequestStream()
16:37:10.385|00D|   System.Net Error: 0 : [3016] Exception in the HttpWebRequest#64912252::EndGetRequestStream - Die zugrunde liegende Verbindung wurde geschlossen: Unerwarteter Fehler beim Senden…
16:38:01.495|009|   System.Net.Sockets Verbose: 0 : [2796] Socket#43549305::Dispose()

Hi, what version of eM Client are you currently using on your computer, can you please check for the exact version number in Help > About?
Are you using any firewall/proxy software on your computer? 

Thank you,
Paul.

eM Client 6.0.21040.0
 running on Win7 newly installed with up to date updates and no windows firewall active
(local network, with local IP)

Router
 default firewall, but port forwarding to Server running baikal
 
 
Sorry for the late answer.