davmail.exchange.ExchangeSession -- all network interfaces down or host unreachable

[tps800]

davmail can login to https://<exchange>/owa, but then fails on ews: ews endpoint not available at https://<exchange>/ews/exchange.asmx: Calling https://<exchange>/owa in a browser displays instantly this servers login. As davmail can, I can then login. But the server does not redirect to ews, but to https://<exchange>/owa/#path=/mail. davmail seems to look for https://<exchange>/ews/exchange.asmx and fails, because this is not available any more -- seems Microsoft made true what had been announced for long: turning down ews-support within exchange.

This problem occurred after installing the latest maintenance fixes from Microsoft on the exchange server today.

2023-04-05 19:37:14,700 DEBUG [CaldavConnection-7882] davmail.http.HttpClientAdapter  - Add cookie [version: 0][name: cadataSig][value: MCxxZlN2gb0klYD3/R0y5ArlANDSyNE37MRRtrKMlD8=][domain: <exchange-server>][path: /][expiry: null]
2023-04-05 19:37:14,701 DEBUG [CaldavConnection-7882] davmail.http.HttpClientAdapter  - Redirect https://<exchange-server>/owa/auth.owa to https://<exchange-server>/owa/
2023-04-05 19:37:14,734 DEBUG [CaldavConnection-7882] davmail.http.DavGatewaySSLSocketFactory  - createSocket <exchange-server> 443
2023-04-05 19:37:14,964 DEBUG [CaldavConnection-7882] davmail.http.HttpClientAdapter  - Add cookie [version: 0][name: ClientId][value: BBBA12F61AC94D4496A9AB3AF0F91017][domain: <exchange-server>][path: /][expiry: Fri Apr 05 19:37:14 CEST 2024]
2023-04-05 19:37:14,966 DEBUG [CaldavConnection-7882] davmail.http.HttpClientAdapter  - Add cookie [version: 0][name: UC][value: c3dd6480975647acb6177d9907188c9d][domain: <exchange-server>][path: /][expiry: null]
2023-04-05 19:37:14,966 DEBUG [CaldavConnection-7882] davmail.http.HttpClientAdapter  - Add cookie [version: 0][name: X-OWA-CANARY][value: UruqOwNUXUGsC1gqQ5ZT-SA7NmX8NdsIBtxANCDaUtHOym6XtOT6kg-uJcLDCXHpnmkUz5Cwq1c.][domain: <exchange-server>][path: /][expiry: null]
2023-04-05 19:37:14,967 DEBUG [CaldavConnection-7882] davmail.http.HttpClientAdapter  - Add cookie [version: 0][name: X-BackEndCookie][value: S-1-5-21-2371448200-2626132239-2341880065-2205=u56Lnp2ejJqBysaax8yZzJ7Sm8qaytLLx8ec0sbNz5rSnJ7OmpvIns3NmZrPgYHNz83M0s/K0s/Kq87IxczIxc7L][domain: <exchange-server>][path: /owa][expiry: Fri May 05 19:37:14 CEST 2023]
2023-04-05 19:37:15,002 DEBUG [CaldavConnection-7882] davmail.exchange.ExchangeSession  - Successfully authenticated to https://<exchange-server>/owa/
2023-04-05 19:37:20,009 DEBUG [CaldavConnection-7882] davmail.http.HttpClientAdapter  - Add cookie [version: 0][name: X-BackEndCookie][value: S-1-5-21-2371448200-2626132239-2341880065-2205=u56Lnp2ejJqBysaax8yZzJ7Sm8qaytLLx8ec0sbNz5rSnJ7OmpvIns3NmZrPgYHNz83M0s/K0s/Kq87IxczIxc3PgZ2ZjNGWkYuajZGBzw==][domain: <exchange-server>][path: /ews][expiry: Fri May 05 19:37:20 CEST 2023]
2023-04-05 19:37:20,033 WARN  [CaldavConnection-7882] davmail.exchange.ExchangeSession  - All network interfaces down or host unreachable !
2023-04-05 19:37:20,034 DEBUG [CaldavConnection-7882] davmail.exchange.ExchangeSession  - java.io.IOException: Ews endpoint not available at https://<exchange-server>/ews/exchange.asmx status 500
java.io.IOException: Ews endpoint not available at https://<exchange-server>/ews/exchange.asmx status 500
    at davmail.exchange.ews.EwsExchangeSession.checkEndPointUrl(EwsExchangeSession.java:230)
    at davmail.exchange.ews.EwsExchangeSession.buildSessionInfo(EwsExchangeSession.java:237)
    at davmail.exchange.ews.EwsExchangeSession.<init>(EwsExchangeSession.java:186)
    at davmail.exchange.ExchangeSessionFactory.getInstance(ExchangeSessionFactory.java:201)
    at davmail.exchange.ExchangeSessionFactory.getInstance(ExchangeSessionFactory.java:97)
    at davmail.caldav.CaldavConnection.run(CaldavConnection.java:178)
2023-04-05 19:37:20,034 WARN  [CaldavConnection-7882] davmail  - All network interfaces down or host unreachable !
2023-04-05 19:37:21,036 DEBUG [CaldavConnection-7882] davmail  - > HTTP/1.1 503 Service Unavailable
2023-04-05 19:37:21,036 DEBUG [CaldavConnection-7882] davmail  - > Server: DavMail Gateway 6.1.0-3422
2023-04-05 19:37:21,036 DEBUG [CaldavConnection-7882] davmail  - > DAV: 1, calendar-access, calendar-auto-schedule, calendarserver-private-events, addressbook
2023-04-05 19:37:21,037 DEBUG [CaldavConnection-7882] davmail  - > Date: Wed, 05 Apr 2023 17:37:21 +0000
2023-04-05 19:37:21,037 DEBUG [CaldavConnection-7882] davmail  - > Expires: Wed, 05 Apr 2023 17:37:21 +0000
2023-04-05 19:37:21,037 DEBUG [CaldavConnection-7882] davmail  - > Cache-Control: private, max-age=0
2023-04-05 19:37:21,038 DEBUG [CaldavConnection-7882] davmail  - > Content-Type: text/plain;charset=UTF-8
2023-04-05 19:37:21,038 DEBUG [CaldavConnection-7882] davmail  - > Connection: close
2023-04-05 19:37:21,039 DEBUG [CaldavConnection-7882] davmail  - > Content-Length: 49
2023-04-05 19:37:21,041 DEBUG [CaldavConnection-7882] davmail  - > 
2023-04-05 19:37:21,041 DEBUG [CaldavConnection-7882] davmail.caldav.CaldavConnection  - > All network interfaces down or host unreachable !
2023-04-05 19:37:21,044 INFO  [CaldavConnection-7882] davmail.connection  - DISCONNECT - 127.0.0.1:7882 

davmails message that "All network interfaces down or host unreachable!" seems false. The host is reachable and its network interfaces are up, but davmail does not find ews-pages on this host.

Fetching mail using davmail fails at the time being.

[esabol]

Status 500 means that the web server at that URL is not operating correctly. Are you sure that URL is correct? Maybe case matters? My davmail.url is set to https://outlook.office365.com/EWS/Exchange.asmx, for example. See also issue #273 for other configuration tips.

[tps800]

Problem solved: they upgraded and applied fixes. Afterwards ews did not start any more and they did not notice. They are working on it now.