[Evolution] evolution-ews error "Connection terminated unexpectedly"

[Dan Kortschak <dan kortschak io>]

I am using evolution with evolution-ews for interaction with a work
email server. The version is 3.28.5-0ubuntu0.18.04.2.

Reasonably regularly I see the following error pop-up. The error does
not appear to cause any fatal problem (though is irritating), so I'm
wondering if the cause is known (and possibly fixed in a more recent
version).

```
Failed to refresh folder “<Account> : <Folder>”.

The reported error was “Connection terminated unexpectedly”.
```

The error usually appears after a period of inactivity in the EWS
account and then switching to it.

Here is an example of the exchange seen in the EWS_DEBUG output.

> POST /EWS/Exchange.asmx HTTP/1.1
> Soup-Debug-Timestamp: 1596612197
> Soup-Debug: SoupSessionAsync 1 (0x563b46138fa0), ESoapMessage 21
(0x563b4571c910), SoupSocket 4 (0x7f5250006780)
> Host: outlook.office365.com
> User-Agent: Evolution/3.28.5
> Connection: Keep-Alive
> Content-Type: text/xml; charset=utf-8
> Authorization: Basic [user domain org:**************]
>
> <?xml version="1.0" encoding="UTF-8" standalone="no"?>
> <SOAP-ENV:Envelope xmlns:SOAP-ENV="
http://schemas.xmlsoap.org/soap/envelope/"; xmlns:SOAP-ENC="
http://schemas.xmlsoap.org/soap/encoding/"; xmlns:xsd="
http://www.w3.org/2001/XMLSchema"; xmlns:xsi="
http://www.w3.org/2001/XMLSchema-instance";><SOAP-ENV:Header><types:RequestServerVersion
 xmlns:types="http://schemas.microsoft.com/exchange/services/2006/types
" Version="Exchange2013"/></SOAP-ENV:Header><SOAP-ENV:Body
xmlns:messages="
http://schemas.microsoft.com/exchange/services/2006/messages";><messages:SyncFolderHierarchy
 xmlns="
http://schemas.microsoft.com/exchange/services/2006/types";><messages:FolderShape><BaseShape>AllProperties</BaseShape></messages:FolderShape><messages:SyncState>[[identifier]]</messages:SyncState></messages:SyncFolderHierarchy></SOAP-ENV:Body></SOAP-ENV:Envelope>
;
  
< HTTP/1.1 7 Connection terminated unexpectedly
< Soup-Debug-Timestamp: 1596612197
< Soup-Debug: ESoapMessage 21 (0x563b4571c910)


Is this something that is known?

thanks
Dan Kortschak