New Release 1.5.1 CardDAV time out to Synology, but Release 1.5.0.3 was ok

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The new Release does not find the CardDAV server at my Synology. But the previous release 1.5.0.3 was fine. Where can I get the previous APK file? Please help!

Can you please provide the exception details / debug info?

I uninstalled the correct working DAVDroid 1.5.0.3 release, then installed new the OpenTask app and then also the new release 1.5.1 of DAVDroid again. But I have trouble now with the CardDAV configuration (https://serveraddress:8443/addressbooks/users/Franz/addressbook/) I got the error message “Es konnte weder ein CalDAV- noch ein CardDAV-Dienst gefunden werden”.

The configuration of DAVDroid 1.5.1 with the Synology CalDAV server to does still work (https://serveraddress:5001/caldav.php/Franz/home/).

2017-04-26 23:09:42 1104 [HttpClient$1] <-- HTTP FAILED: java.net.SocketTimeoutException: connect timed out
2017-04-26 23:09:42 1104 [ui.setup.DavResourceFinder] PROPFIND/OPTIONS on user-given URL failed
EXCEPTION java.net.SocketTimeoutException: connect timed out
	at java.net.PlainSocketImpl.socketConnect(Native Method)
	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:334)
	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:196)
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:356)
	at java.net.Socket.connect(Socket.java:586)
	at okhttp3.internal.platform.AndroidPlatform.connectSocket(AndroidPlatform.java:63)
	at okhttp3.internal.connection.RealConnection.connectSocket(RealConnection.java:221)
	at okhttp3.internal.connection.RealConnection.connect(RealConnection.java:147)
	at okhttp3.internal.connection.StreamAllocation.findConnection(StreamAllocation.java:192)
	at okhttp3.internal.connection.StreamAllocation.findHealthyConnection(StreamAllocation.java:121)
	at okhttp3.internal.connection.StreamAllocation.newStream(StreamAllocation.java:100)
	at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:42)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
	at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:93)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
	at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
	at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:120)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
	at okhttp3.logging.HttpLoggingInterceptor.intercept(HttpLoggingInterceptor.java:211)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
	at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:185)
	at okhttp3.RealCall.execute(RealCall.java:69)
	at at.bitfire.dav4android.DavResource.propfind(DavResource.java:276)
	at at.bitfire.davdroid.ui.setup.DavResourceFinder.checkUserGivenURL(DavResourceFinder.java:179)
	at at.bitfire.davdroid.ui.setup.DavResourceFinder.findInitialConfiguration(DavResourceFinder.java:119)
	at at.bitfire.davdroid.ui.setup.DavResourceFinder.findInitialConfiguration(DavResourceFinder.java:90)
	at at.bitfire.davdroid.ui.setup.DetectConfigurationFragment$ServerConfigurationLoader.loadInBackground(DetectConfigurationFragment.java:142)
	at at.bitfire.davdroid.ui.setup.DetectConfigurationFragment$ServerConfigurationLoader.loadInBackground(DetectConfigurationFragment.java:125)
	at android.support.v4.content.AsyncTaskLoader.onLoadInBackground(AsyncTaskLoader.java:302)
	at android.support.v4.content.AsyncTaskLoader$LoadTask.doInBackground(AsyncTaskLoader.java:57)
	at android.support.v4.content.AsyncTaskLoader$LoadTask.doInBackground(AsyncTaskLoader.java:45)
	at android.support.v4.content.ModernAsyncTask$2.call(ModernAsyncTask.java:138)
	at java.util.concurrent.FutureTask.run(FutureTask.java:237)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
	at java.lang.Thread.run(Thread.java:761)

Thanks. Are you sure that this is not a networking problem? Sounds like a firewalling problem or something like that. Also, 1.5.1 didn’t change anything related to connections, if it worked with 1.5.0.3.

It could not be a networking problem, because the CalDAV configuration and synchronisation does work. The problem is only by CardDAV with the new Release 1.5.1. And I have tested the http (8008) and the https (8443) port of the CardDAV synology server. My CardBook (AddIn) integration in Thunderbird is also still working too.
How can I get / download the previous davdroid.apk of release 1.5.0.3?

Where did you get DAVdroid from? Play Store?

Yes, I bought the app DAVdroid at Google Play Store about two weeks ago.

Many thanks for your fast help. The problem was the firewall of the synology diskstation.
The last update of the CardDAV server package, a few days ago, has disabled both ports in the firewall configuration!

Synology -> Security -> Firewall

My calendar and contacts are now correctly synchronized with DAVdroid again.