Android Question CLEARTEXT communication to 192.168.0.101 not permitted by network security policy

beelze69 · Jun 29, 2020

Hi All,

I tried to implement the JRDC2 implementation of Erel in one program.

The implementation of Erel is in the below URL:

[B4X] jRDC2 - B4J implementation of RDC (Remote Database Connector)

New version: https://www.b4x.com/android/forum/threads/b4x-jrdc-3-remote-database-connector.171345/ RDC is a middleware server that makes it simple to safely connect clients and remote SQL database servers. jRDC2 is the latest version. All new projects should use this version. jRDC2 is made...

www.b4x.com

I get the following error:

ResponseError. Reason: java.net.UnknownServiceException: CLEARTEXT communication to 192.168.0.101 not permitted by network security policy, Response:
ERROR: java.net.UnknownServiceException: CLEARTEXT communication to 192.168.0.101 not permitted by network security policy
ResponseError. Reason: java.net.UnknownServiceException: CLEARTEXT communication to 192.168.0.101 not permitted by network security policy, Response:
ERROR: java.net.UnknownServiceException: CLEARTEXT communication to 192.168.0.101 not permitted by network security policy

I have done the folllowing:

1) Opened 17178 port on my PC firewall (both INBOUND and OUTBOUND)
2) My JRDC2 server is running successfully.

Issue 1) However I am unable to fetch any data on the B4A application.

Issue 2) Hence I attempted to directly compile it to the device and try it from there but I am getting the above error message which I typed above.

Issue 3) I made the entry
android:usesCleartextTraffic="true" in the Androidmanifest.xml in the 'Objects' folder of my application and recompiled it successfully.
However, when I again open my Androidmanifest.xml file , it DOES NOT show the entry ..
So , is the Androidmanifest.xml being picked up from somewhere else everytime the compilation is being done by the IDE .. If so , from where ?

Please help..

aeric · Jun 29, 2020

android.jar / targetSdkVersion / minSdkVersion

There are several versioned components that affect the compilation process and the runtime behavior of our apps. The purpose of this tutorial is to explain the differences between them and help you choose which version to use. Each Android version is mapped to an api level. You can see this...

www.b4x.com

Add below to your Manifest Editor:

B4X: Copy

' 28 - Non-ssl (non-https) communication is not permitted by default.
' It can be enabled in B4A v9+ by adding this line to the manifest editor:
CreateResourceFromFile(Macro, Core.NetworkClearText)

JohnC · Jun 29, 2020

You need to *always* edit the manifest file from the IDE using "Project....Manifest Editor" (in other words don't edit it in the objects folder).

drgottjr · Jun 29, 2020

Issue 3) I made the entry
android:usesCleartextTraffic="true" in the Androidmanifest.xml in the 'Objects' folder of my application and recompiled it successfully.
However, when I again open my Androidmanifest.xml file , it DOES NOT show the entry ..
So , is the Androidmanifest.xml being picked up from somewhere else everytime the compilation is being done by the IDE .. If so , from where ?

use the manifest editer from within the ide. not the manifest in the objects folder. it gets clobbered when you compile.

KMatle · Jun 29, 2020

So reduce the target sdk to <=26 (or so). Whith newer Android versions it's not allowed anymore to communicate without SSL (= "Cleartext").

beelze69 · Jun 29, 2020

KMatle said:
So reduce the target sdk to <=26 (or so). Whith newer Android versions it's not allowed anymore to communicate without SSL (= "Cleartext").

Hi KMatle,

Strangely it worked for me with Target SDK version = 28 .. I also removed the entry android:usesCleartextTraffic="true" . However, I put the entry advised by aeric

viz.
' 28 - Non-ssl (non-https) communication is not permitted by default.
' It can be enabled in B4A v9+ by adding this line to the manifest editor:
CreateResourceFromFile(Macro, Core.NetworkClearText)

And it worked for me.. In fact, many have suggested the way you have done viz. reducing the Target SDK to <=26..

But somehow it worked for me with 28

Thank you very much for helping ..

beelze69 · Jun 29, 2020

aeric said:
android.jar / targetSdkVersion / minSdkVersion

There are several versioned components that affect the compilation process and the runtime behavior of our apps. The purpose of this tutorial is to explain the differences between them and help you choose which version to use. Each Android version is mapped to an api level. You can see this...

www.b4x.com

Add below to your Manifest Editor:

B4X: Copy

' 28 - Non-ssl (non-https) communication is not permitted by default. ' It can be enabled in B4A v9+ by adding this line to the manifest editor: CreateResourceFromFile(Macro, Core.NetworkClearText)

Hi aeric !

Thank you very much ! Your tip worked for me ! I also removed the entry android:usesCleartextTraffic="true" .. It seems that is also not required.
Actually I am still learning.
Thank you very much for helping me.

aeric · Jun 29, 2020

beelze69 said:
Hi aeric !

Thank you very much ! Your tip worked for me ! I also removed the entry android:usesCleartextTraffic="true" .. It seems that is also not required.
Actually I am still learning.
Thank you very much for helping me.

This is how the community works. We help each other by providing solutions. Sometimes it is a working solution and sometimes not. Someone may have faced the same issue before so you may found the answer using the search box on top of this forum.

JohnC · Jun 29, 2020

beelze69 said:
I also removed the entry android:usesCleartextTraffic="true" .. It seems that is also not required

The format I use for that option in B4A is:

B4X: Copy

SetApplicationAttribute(android:usesCleartextTraffic, "true")

The CreateResourceFromFile(Macro, Core.NetworkClearText) is a macro that creates the above line in the manifest when compiled - so the two basically do the same thing - you could include either one and it will work.

But the original reason why it wasn't working for you was because you were trying to edit the manifest file from outside the IDE and that's why your edits didn't "stick".

I am glad you got it working

beelze69 · Jun 30, 2020

aeric said:
android.jar / targetSdkVersion / minSdkVersion

There are several versioned components that affect the compilation process and the runtime behavior of our apps. The purpose of this tutorial is to explain the differences between them and help you choose which version to use. Each Android version is mapped to an api level. You can see this...

www.b4x.com

Add below to your Manifest Editor:

B4X: Copy

' 28 - Non-ssl (non-https) communication is not permitted by default. ' It can be enabled in B4A v9+ by adding this line to the manifest editor: CreateResourceFromFile(Macro, Core.NetworkClearText)

JohnC said:
The format I use for that option in B4A is:

B4X: Copy

SetApplicationAttribute(android:usesCleartextTraffic, "true")

The CreateResourceFromFile(Macro, Core.NetworkClearText) is a macro that creates the above line in the manifest when compiled - so the two basically do the same thing - you could include either one and it will work.

But the original reason why it wasn't working for you was because you were trying to edit the manifest file from outside the IDE and that's why your edits didn't "stick".

I am glad you got it working

Hi John !

I will also try your way.. Thank you very much

JohnC · Jun 30, 2020

beelze69 said:
I will also try your way.. Thank you very much

No need to use "my" way - #@aeric 's way is basically the same thing.

I just wanted to make sure that you knew to always edit the manifest from within the IDE and not out of it - that's all.

beelze69 · Jul 1, 2020

JohnC said:
No need to use "my" way - #@aeric 's way is basically the same thing.

I just wanted to make sure that you knew to always edit the manifest from within the IDE and not out of it - that's all.

Ok.. Thank you

rogeriosca · Feb 11, 2021

KMatle said:
So reduce the target sdk to <=26 (or so). Whith newer Android versions it's not allowed anymore to communicate without SSL (= "Cleartext").

Worked for me, thanks !

CanelaKid · May 9, 2021

JohnC said:
The format I use for that option in B4A is:

B4X: Copy

SetApplicationAttribute(android:usesCleartextTraffic, "true")

The CreateResourceFromFile(Macro, Core.NetworkClearText) is a macro that creates the above line in the manifest when compiled - so the two basically do the same thing - you could include either one and it will work.

But the original reason why it wasn't working for you was because you were trying to edit the manifest file from outside the IDE and that's why your edits didn't "stick".

I am glad you got it working

Also worked for me, no problem. Thanks for the solution

jeronimovilar · Sep 24, 2022

Why is not possible connect a server/machine on Intranet?
firewall disabled
my server is 192.168.0.100 and name is JV.
My SQL Server is: "JV\SQLEXPRESS"

Try Internet is ok: j.Download("http://www.google.com")
connect is ok with IP number: j.Download("http://192.168.0.168/xxx.asp")
but....
it´s not possibel with j.Download("http://JV/xxx.asp")

Why?

aeric · Sep 25, 2022

jeronimovilar said:
my server is 192.168.0.100

Is this a web server? Using IIS?

Please create a new thread.

jeronimovilar · Sep 25, 2022

I´m using IIS
Windows 10

Android Question CLEARTEXT communication to 192.168.0.101 not permitted by network security policy

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