Ok now I fixed the problem myself: I just needed to install php7.0-mbstring, php7.0-xmlrpc and some other php7.0 packages and now it works 
Beiträge von Der Eberhardt
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After hours of work I couldn't recover the webgui and now I'm a bit desperate...
I must admit that I have changed some nginx configurations earlier when I tried to set up nextcloud with php7.2, though this worked without problems with omv 3. Currently, after upgrading, I have two errors, depending on which php version I choose:
-With php7.2 or php5.6 the login form does work, but when I try to log in an error appears with following content:CodeFehler #0: OMV\Rpc\Exception: Failed to connect to socket: No such file or directory in /usr/share/php/openmediavault/rpc/rpc.inc:140 Stack trace: #0 /var/www/openmediavault/rpc/session.inc(56): OMV\Rpc\Rpc::call('UserMgmt', 'authUser', Array, Array, 2, true) #1 [internal function]: OMVRpcServiceSession->login(Array, Array) #2 /usr/share/php/openmediavault/rpc/serviceabstract.inc(123): call_user_func_array(Array, Array) #3 /usr/share/php/openmediavault/rpc/rpc.inc(86): OMV\Rpc\ServiceAbstract->callMethod('login', Array, Array) #4 /usr/share/php/openmediavault/rpc/proxy/json.inc(95): OMV\Rpc\Rpc::call('Session', 'login', Array, Array, 3) #5 /var/www/openmediavault/rpc.php(45): OMV\Rpc\Proxy\Json->handle() #6 {main}In this case the password doesn't matter, it will always end with the same error.
-Using the standard configuration (fastcgi_pass unix:/var/run/php-fpm-openmediavault-webgui.sock) will result in a completely empty website, but in the webgui.log says this:
Code
Alles anzeigen2018/03/30 22:40:41 [error] 6879#6879: *2 FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught Error: Call to undefined function mb_detect_encoding() in /usr/share/php/openmediavault/functions.inc:589 Stack trace: #0 /usr/share/php/openmediavault/functions.inc(623): var_utf8_encode('{\n\t"type": "con...') #1 /usr/share/php/openmediavault/functions.inc(440): json_decode_safe('{\n\t"type": "con...') #2 /usr/share/php/openmediavault/json/file.inc(116): is_json('{\n\t"type": "con...') #3 /usr/share/php/openmediavault/json/file.inc(216): OMV\Json\File->validate('{\n\t"type": "con...') #4 /usr/share/php/openmediavault/datamodel/manager.inc(62): OMV\Json\File->read() #5 /usr/share/php/openmediavault/env.inc(40): OMV\DataModel\Manager->load() #6 /var/www/openmediavault/index.php(24): require_once('/usr/share/php/...') #7 {main} thrown in /usr/share/php/openmediavault/functions.inc on line 589" while reading response header from upstream, client: 192.168.178.20, server: nas, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php-fpm-openmediavault-webgui.sock:", host: "nas"
(As you may have noticed I've installed multiple php versions (to try out if one of them would work): php5, php5.6, php7.0 and php7.2)
Many thanks in advance