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Authentication Fails on POP/IMAP/Outlook, but OWA works

My mailboxes are failing Authentication, despite OWA Authentication and mailflow working.
Have tried many many things from all relevant forums I could find... (see more info at end)

From what I can tell, the mailbox exists and details correct, but some or other service isn't looking where it should for the users in order to Authenticate.

Note that this is a Hosted Exchange setup, but I don't believe the problem is specifically linked to that. I have setup several Hosted lab environments where it worked fine. Difference being this is now the production server and all the roles are split up.

Another note: I am having another issue with DAG creation where it give a Access Deniedfor creating the Witness Folder despite all the permissions/memberships being 100%. Maybe the problem there is the same one causing this issue. I am also worried it might be effecting more things that I don't see yet.

(The environment is managed only via EMS)

______________________________________________________________________

Servers:
2x DC
1x CA
1x HT (internet facing)
2x MB (not in DAG)

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[PS] C:\Windows\system32>Get-ImapSettings |fl


RunspaceId                        : 371ec7c4-46b4-4977-a978-b43587ceaa75
ProtocolName                      : IMAP4
Name                              : 1
MaxCommandSize                    : 10240
ShowHiddenFoldersEnabled          : False
UnencryptedOrTLSBindings          : {:::143, 0.0.0.0:143}
SSLBindings                       : {:::993, 0.0.0.0:993}
InternalConnectionSettings        : {ca1.mydomain.com:993:SSL, ca1.mydomain.com:143:TLS}
ExternalConnectionSettings        : {mail.mydomain.com:993:SSL}
X509CertificateName               : ca1
Banner                            : The Microsoft Exchange IMAP4 service is ready.
LoginType                         : PlainTextLogin
AuthenticatedConnectionTimeout    : 00:30:00
PreAuthenticatedConnectionTimeout : 00:01:00
MaxConnections                    : 2147483647
MaxConnectionFromSingleIP         : 2147483647
MaxConnectionsPerUser             : 16
MessageRetrievalMimeFormat        : BestBodyFormat
ProxyTargetPort                   : 143
CalendarItemRetrievalOption       : iCalendar
OwaServerUrl                      :
EnableExactRFC822Size             : False
LiveIdBasicAuthReplacement        : False
SuppressReadReceipt               : False
ProtocolLogEnabled                : False
EnforceCertificateErrors          : False
LogFileLocation                   : C:\Program Files\Microsoft\Exchange Server\V14\Logging\Imap4
LogFileRollOverSettings           : Daily
LogPerFileSizeQuota               : 0 B (0 bytes)
ExtendedProtectionPolicy          : None
EnableGSSAPIAndNTLMAuth           : True
Server                            : CA1
AdminDisplayName                  :
ExchangeVersion                   : 0.10 (14.0.100.0)
DistinguishedName                 : CN=1,CN=IMAP4,CN=Protocols,CN=CA1,CN=Servers,CN=Exchange Administrative Group (FYDI
                                    BOHF23SPDLT),CN=Administrative Groups,CN=AdeptOrg,CN=Microsoft Exchange,CN=Services
                                    ,CN=Configuration,DC=he,DC=adept,DC=za,DC=net
Identity                          : CA1\1
Guid                              : e76e43da-c7cb-4fe1-8bcf-110fce8b52db
ObjectCategory                    : he.mydomain.com/Configuration/Schema/ms-Exch-Protocol-Cfg-IMAP-Server
ObjectClass                       : {top, protocolCfg, protocolCfgIMAP, protocolCfgIMAPServer}
WhenChanged                       : 2013/01/03 02:22:17 PM
WhenCreated                       : 2012/12/14 12:15:05 PM
WhenChangedUTC                    : 2013/01/03 12:22:17 PM
WhenCreatedUTC                    : 2012/12/14 10:15:05 AM
OrganizationId                    :
OriginatingServer                 : DC2.mydomain.com
IsValid                           : True

______________________________________________________________________


[PS] C:\Windows\system32>Get-ReceiveConnector |fl


RunspaceId                              : 371ec7c4-46b4-4977-a978-b43587ceaa75
AuthMechanism                           : Tls
Banner                                  :
BinaryMimeEnabled                       : True
Bindings                                : {0.0.0.0:143, 0.0.0.0:587, 0.0.0.0:25}
ChunkingEnabled                         : True
DefaultDomain                           :
DeliveryStatusNotificationEnabled       : True
EightBitMimeEnabled                     : True
BareLinefeedRejectionEnabled            : False
DomainSecureEnabled                     : False
EnhancedStatusCodesEnabled              : True
LongAddressesEnabled                    : False
OrarEnabled                             : False
SuppressXAnonymousTls                   : False
AdvertiseClientSettings                 : False
Fqdn                                    : HT1.mydomain.com
Comment                                 :
Enabled                                 : True
ConnectionTimeout                       : 00:10:00
ConnectionInactivityTimeout             : 00:05:00
MessageRateLimit                        : unlimited
MessageRateSource                       : IPAddress
MaxInboundConnection                    : 5000
MaxInboundConnectionPerSource           : 20
MaxInboundConnectionPercentagePerSource : 2
MaxHeaderSize                           : 64 KB (65,536 bytes)
MaxHopCount                             : 60
MaxLocalHopCount                        : 12
MaxLogonFailures                        : 3
MaxMessageSize                          : 10 MB (10,485,760 bytes)
MaxProtocolErrors                       : 5
MaxRecipientsPerMessage                 : 200
PermissionGroups                        : AnonymousUsers
PipeliningEnabled                       : True
ProtocolLoggingLevel                    : None
RemoteIPRanges                          : {0.0.0.0-255.255.255.255}
RequireEHLODomain                       : False
RequireTLS                              : False
EnableAuthGSSAPI                        : False
ExtendedProtectionPolicy                : None
LiveCredentialEnabled                   : False
TlsDomainCapabilities                   : {}
Server                                  : HT1
SizeEnabled                             : Enabled
TarpitInterval                          : 00:00:05
MaxAcknowledgementDelay                 : 00:00:30
AdminDisplayName                        :
ExchangeVersion                         : 0.1 (8.0.535.0)
Name                                    : TestAgain
DistinguishedName                       : CN=TestAgain,CN=SMTP Receive Connectors,CN=Protocols,CN=HT1,CN=Servers,CN=Exc
                                          hange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=Adep
                                          tOrg,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=he,DC=mydomain,DC=co,
                                          DC=za
Identity                                : HT1\TestAgain
Guid                                    : e97c8a25-1a78-4294-a0c9-15a633c2b03e
ObjectCategory                          : mydomain.com/Configuration/Schema/ms-Exch-Smtp-Receive-Connector
ObjectClass                             : {top, msExchSmtpReceiveConnector}
WhenChanged                             : 2013/01/03 07:15:23 PM
WhenCreated                             : 2013/01/03 04:55:39 PM
WhenChangedUTC                          : 2013/01/03 05:15:23 PM
WhenCreatedUTC                          : 2013/01/03 02:55:39 PM
OrganizationId                          :
OriginatingServer                       : DC2.mydomain.com
IsValid                                 : True

______________________________________________________________________


[PS] C:\Windows\system32>Get-CASMailbox -Organization mydomain.co.za |fl

RunspaceId                         : 371ec7c4-46b4-4977-a978-b43587ceaa75
EmailAddresses                     : {SMTP:myuser@mydomain.com}
LegacyExchangeDN                   : /o=mydomainOrg/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=Ly
                                     don200c8011
LinkedMasterAccount                :
PrimarySmtpAddress                 : myuser@mydomain.com
SamAccountName                     : myuser
ServerLegacyDN                     : /o=mydomainOrg/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Configuration/cn
                                     =Servers/cn=MB2
ServerName                         : mb2
DisplayName                        : myuser
ActiveSyncAllowedDeviceIDs         : {}
ActiveSyncBlockedDeviceIDs         : {}
ActiveSyncMailboxPolicy            : mydomain\Default
ActiveSyncMailboxPolicyIsDefaulted : True
ActiveSyncDebugLogging             :
ActiveSyncEnabled                  : True
HasActiveSyncDevicePartnership     : False
ExternalImapSettings               :
InternalImapSettings               :
ExternalPopSettings                :
InternalPopSettings                :
ExternalSmtpSettings               :
InternalSmtpSettings               :
OwaMailboxPolicy                   : mydomain\OwaMailboxPolicy-Default
OWAEnabled                         : True
ECPEnabled                         : True
EmwsEnabled                        : False
PopEnabled                         : True
PopUseProtocolDefaults             : True
PopMessagesRetrievalMimeFormat     : BestBodyFormat
PopEnableExactRFC822Size           : False
PopSuppressReadReceipt             : False
ImapEnabled                        : True
ImapUseProtocolDefaults            : True
ImapMessagesRetrievalMimeFormat    : BestBodyFormat
ImapEnableExactRFC822Size          : False
ImapSuppressReadReceipt            : False
MAPIEnabled                        : True
MAPIBlockOutlookNonCachedMode      : False
MAPIBlockOutlookVersions           :
MAPIBlockOutlookRpcHttp            : False
EwsEnabled                         : True
EwsAllowOutlook                    :
EwsAllowMacOutlook                 :
EwsAllowEntourage                  :
EwsApplicationAccessPolicy         :
EwsAllowList                       :
EwsBlockList                       :
ShowGalAsDefaultView               : True
IsValid                            : True
ExchangeVersion                    : 0.10 (14.0.100.0)
Name                               : myuser
DistinguishedName                  : CN=myuser,OU=mydomain,OU=Microsoft Exchange Hosted Organizations,DC=he,DC=mydomain,
                                     DC=za,DC=net
Identity                           : mydomain.com/Microsoft Exchange Hosted Organizations/mydomain/myuser
Guid                               : c1796595-54e7-481f-b82c-b50e52049cb3
ObjectCategory                     : mydomain.com/Configuration/Schema/Person
ObjectClass                        : {top, person, organizationalPerson, user}
WhenChanged                        : 2013/01/03 07:25:57 PM
WhenCreated                        : 2012/12/28 09:54:36 AM
WhenChangedUTC                     : 2013/01/03 05:25:57 PM
WhenCreatedUTC                     : 2012/12/28 07:54:36 AM
OrganizationId                     : mydomain.com/Microsoft Exchange Hosted Organizations/mydomain - he.mydomain.za.
                                     net/Configuration/Services/Microsoft Exchange/ConfigurationUnits/mydomain/Confi
                                     guration
OriginatingServer                  : dc1.mydomain.com

______________________________________________________________________

[PS] C:\Windows\system32>telnet localhost 110
+OK The Microsoft Exchange POP3 service is ready.
user myuser@mydomain.co.za
+OK
pass Something321
-ERR Logon failure: unknown user name or bad password.

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C:\Program Files\Microsoft\Exchange Server\V14\Logging\Pop3

2013-01-03T17:25:19.097Z,0000000000000002,0,::1:110,::1:59877,,-2147483648,0,51,OpenSession,,
2013-01-03T17:25:32.216Z,0000000000000002,1,::1:110,::1:59877,,78,32,5,user,myuservz@mydomain.co.za,R=ok
2013-01-03T17:25:39.751Z,0000000000000002,2,::1:110,::1:59877,,3198,10,56,pass,*****,"R=""-ERR Logon failure: unknown user name or bad password."";RpcC=7;RpcL=31;LdapC=12;LdapL=32;Msg=""User:myuser van Zyl:72005f71-deaf-4788-94bf-6872dbbd3aaa:mb2db1:MB2.mydomain.za.net"";Excpt=""Cannot open mailbox /o=AdeptOrg/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=myuservza9e753cc.-AccessDeniedException/MapiExceptionNoAccess"""
2013-01-03T17:26:18.907Z,0000000000000002,3,::1:110,::1:59877,,0,0,31,CloseSession,,

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EventViewer> Windows Logs> Application

*(no other logs that seem relevant )

Warning: Basic authentication is available over plain text connections.

______________________________________________________________________

Other notes:

- as per other forum : http://social.technet.microsoft.com/Forums/da-DK/exchangesvrdeploylegacy/thread/1ad1b55e-8cc6-4676-87ee-0a6216f1b399 , I added the code that was missing in services: C:\Program Files\Microsoft\Exchange Server\V14\ClientAccess\PopImap\Microsoft.Exchange.Pop3.exe& Microsoft.Exchange.Imap4Service.exe
- firewall turned off
- tried ticking the box for "Do not require Kerberos Authentication"
- have tried moving mailbox from one DB to another

Cannot think what else might be relevant, really appreciate any ideas or advise..


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