Switch from IMAP to EWS - connection refused
We are trying to switch from IMAP to EWS so we can disable IMAP/POP on our Office 365 tenancy. We have confirmed our settings but are getting a connection refused error when we try to save the settings. We enabled debugging in the log and can see this reported below. We have also tried pasting the EWS connection string into a browser on the server and this generates a credential prompt so it appears to not be a network issue.
We're running 11.1 Build 11103
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: Caused by: org.apache.http.conn.HttpHostConnectException: Connect to outlook.office365.com:443 [outlook.office365.com/52.97.133.210, outlook.office365.com/52.97.165.146, outlook.office365.com/40.100.174.210, outlook.office365.com/52.97.133.194] failed: Connection refused: connect|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:151)|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: at org.apache.http.impl.conn.BasicHttpClientConnectionManager.connect(BasicHttpClientConnectionManager.java:338)|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:380)|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236)|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184)|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88)|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: at microsoft.exchange.webservices.data.core.request.HttpClientWebRequest.executeRequest(HttpClientWebRequest.java:292)|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: at microsoft.exchange.webservices.data.core.request.ServiceRequestBase.getEwsHttpWebResponse(ServiceRequestBase.java:720)|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: ... 82 more|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: Caused by: java.net.ConnectException: Connection refused: connect|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: at java.net.Socket.connect(Socket.java:589)|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: at org.apache.http.conn.ssl.SSLConnectionSocketFactory.connectSocket(SSLConnectionSocketFactory.java:337)|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:134)|
[08:26:29:839]|[07-10-2020]|[SYSERR]|[INFO]|[53]: ... 92 more|
[08:26:29:839]|[07-10-2020]|[com.adventnet.servicedesk.utils.ServiceDeskUtil]|[SEVERE]|[53]: FAILURE :E-mail settings saved successfully.
But error occurred while trying to check connection with mail server - Problem connecting to mailbox.|