#240 davmail - exchange 2013: Ews endpoint not available

[Mathias Vaterlaus]

Hi,
I don't know, if I really do need to fill out a support request, or if it is a misconfiguration. We are using the following software to connect our linux users with exchange:

• We use Exchange 2013 with ews enabled (I doulbe checked with the Exchange admin, and I can connect to the ews website of our exchange server).
• We have configured basic authentication and the integrated windows authentication in exchange.
• All Linux users use Thunderbird Version 31.5.0.
• Accounts are connected via IMAP
• Davmail Version 4.6.1-2343 (x86_64)
• Java Version is: oracle-jdk 1.7.0.76

---

davmail config

davmail.server=true
davmail.enableEws=true
davmail.url=https://host.domain.ch/ews/exchange.asmx

davmail.caldavPort=1080
davmail.imapPort=1143
davmail.ldapPort=1389
davmail.popPort=1110
davmail.smtpPort=1025

davmail.enableProxy=false
davmail.useSystemProxies=false
davmail.proxyHost=
davmail.proxyPort=
davmail.proxyUser=
davmail.proxyPassword=
davmail.noProxyFor=

davmail.allowRemote=true
davmail.bindAddress=xxx.xxx.xxx.xxx
davmail.clientSoTimeout=

davmail.ssl.keystoreType=
davmail.ssl.keystoreFile=
davmail.ssl.keystorePass=
davmail.ssl.keyPass=

davmail.server.certificate.hash=

davmail.ssl.nosecurecaldav=false
davmail.ssl.nosecureimap=false
davmail.ssl.nosecureldap=false
davmail.ssl.nosecurepop=false
davmail.ssl.nosecuresmtp=false

davmail.disableUpdateCheck=true

davmail.enableKeepalive=true
davmail.folderSizeLimit=0
davmail.defaultDomain=

davmail.caldavAlarmSound=
davmail.caldavPastDelay=90
davmail.forceActiveSyncUpdate=false

davmail.imapAutoExpunge=true
davmail.imapIdleDelay=

davmail.keepDelay=30
davmail.sentKeepDelay=90
davmail.popMarkReadOnRetr=false
davmail.smtpSaveInSent=false

davmail.logFilePath=/var/log/davmail.log
davmail.logFileSize=1MB
log4j.logger.davmail=ERROR
log4j.logger.httpclient.wire=ERROR
log4j.logger.org.apache.commons.httpclient=ERROR
log4j.rootLogger=ERROR

davmail.ssl.pkcs11Config=
davmail.ssl.pkcs11Library=

davmail.ssl.clientKeystoreType=
davmail.ssl.clientKeystoreFile=
davmail.ssl.clientKeystorePass=

davmail.disableGuiNotifications=true
davmail.showStartupBanner=false

davmail.enableKerberos=false

---

As you can see, I removed the domain name and the binding IP Adress in the above config sample.

The Problem is, that sometimes the synchronisation of public folders is very slow. Also, sometimes it does not work to synchronize a public folder at all. When I look at the logs, I see the following error message:

2015-03-20 13:44:35,931 ERROR [ImapConnection-59373] davmail.exchange.ExchangeSession - Ews endpoint not available at /ews/exchange.asmx status 500
2015-03-20 13:44:35,931 ERROR [ImapConnection-59373] davmail.exchange.ExchangeSession - EWS end point not available
2015-03-20 13:44:35,931 ERROR [ImapConnection-59373] davmail - EWS end point not available
davmail.exception.DavMailAuthenticationException: EWS end point not available
at davmail.exchange.ews.EwsExchangeSession.buildSessionInfo(EwsExchangeSession.java:259)
at davmail.exchange.ExchangeSession.<init>(ExchangeSession.java:235)
at davmail.exchange.ews.EwsExchangeSession.<init>(EwsExchangeSession.java:138)
at davmail.exchange.ExchangeSessionFactory.getInstance(ExchangeSessionFactory.java:143)
at davmail.exchange.ExchangeSessionFactory.getInstance(ExchangeSessionFactory.java:90)
at davmail.imap.ImapConnection.run(ImapConnection.java:112)

I'm having the impression, that this problem is the same as described in the following support request: http://sourceforge.net/p/davmail/support-requests/236/

Could you please have a look at it and maybe give me a hint, what I am doing wrong? Also, if there is anything to test, I will be happy to do it for you.

Best Regards

Mathias Vaterlaus

[metatech]

Have you tried downgrading to Java 1.7.0.72 ?
https://sourceforge.net/p/davmail/mailman/message/33587504/

[Mathias Vaterlaus]

thx for the tip. I now downgraded java to version 1.7.0.72. I will have a look, if it performs better than the newer version. I will report back as soon as possible.

[Mathias Vaterlaus]

I checked the log and the above error messages are back. So I guess, it has nothing to do with the newer java version. I updgraded java again, because the version 1.7.0.72 is only available via an overlay.

[Mickael Guessant]

You should probably check Exchange logs on the server side: 500 means something is wrong on this side

[Mathias Vaterlaus]

Hi Mickael,
sorry, that I did not reply in such a long time. You were right, the problems come from the exchange server. It seems, that our ews users hit a throotling policy.
At the moment, I have configured davmail.folderSizeLimit=50 and everything works fine. But this introduces a regression, because only 50 elements are shown in the mailbox. Luckily, this does not apply to searches, so e-mails, which are not among the 50 newest are still displayed.

We now try to find the corresponding exchange policy and increase or disable it, so we can undo the foldersize change in davmail.

Again, thanks a lot for your help and tips.

Best regards

Mathias Vaterlaus