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Android Devices Unable to Consume REST Service on Wifi

Hello there long time reader of Stack Overflow but first time poster,
I am a bit new to android development but we decided to build a Xamarin.Forms app which consumes our ASP.NET REST service. When running the app on an emulator on my computer, connected via ethernet, I am able to connect to the service. However, when running on a tablet or phone that is connected on our work wifi, the connection just hangs and times out.
Interesting enough, when the device is switched to mobile data it can connect to the endpoints again, and iPhones can connect to the endpoints on mobile data or wifi.
I'm curious what I'm missing here. Please let me know what you think or additional information I should include.

While this thread has been opened for some time, we have found our problem resolved: it was a mixture of our network support changing some settings on our routers (though I can unfortunately not remember what settings) and also our tablets do a system update.
I am not sure which of these factors was the cause of our success now but the issue is done. I just wanted to post this in case anyone else ran into something similar.

Log all user and network activities Android

I would like to create logfiles of the activities on my Android phone.
The goal is to be able to trace back any suspicious activities of apps and check if the phone's been hacked.
In this question someone suggested using a proxy server.
But using a proxy changes the ip used and a lot of services (i.e. Netflix) block mobile traffic coming from either server ip's or home ip's when making mobile requests.
The question is already 3.5 years old so maybe the options have changed.
As for the network traffic an option to setup a local proxy on the device itself with a possibility to set logging rules would work though.
How could you setup a local proxy on an Android device?
However this is only the first part as to find possible suspicious activities. But without logging the actual phone activities it will be difficult (or impossible) to actually find out which malicious code or app is doing this.
How can we log activities on Android?
I think when loggin all user activities like touch events etc. and all calls between apps would suffice.
Can this be done without rooting the device? And if not how would one do this on a rooted device?
I would prefer to have this device independent, but I use an Oneplus 6 with Oxygen OS.

Android TV SDK : Setting Proxy for the Emulator?

I have installed the Android TV SDK Developer preview for Windows. I am in a corporate intranet environment. I can start the Emulator, but the main screen endlessly loops with the "Preparing Recommendations" animation. I can navigate to the Settings and see that there is no network (no wired and no ethernet).
I suspect this might be a proxy issue. I have tried launching the Emulator with the following command:
C:\Eclipse_w_Android\adt-bundle-windows-x86-20140624\sdk\tools>emulator -avd AVD_for_Android_TV_1080p_by_Google_X86 -http-proxy http://MY_PROXY_IP:8080
(MY_PROXY_IP is replaced with my company's IP address)
It launches the Emulator but doesn't seem to have any effect on the network.
Has anyone else been able to get the Android TV Emulator to fully load in a heavily firewalled / proxied environment?

I thought I was experiencing this issue as well (and had originally commented as such), but I later realized that there was no actually connectivity problem. Two things to note:
"Preparing Recommendations" will appear indefinitely, and I presume this is simply because there are no apps by default feeding recommendations to populate this screen.
Both the Ethernet and Wireless items will show that they are not connected. However, if you run an app that uses the network (a simple WebView is sufficient as long as the app has INTERNET permissions), you'll see that it connects just fine.
I would suggest trying a test app to check connectivity, as there is no other indicator I can find suggesting that it is working properly. I suspect you'll find that all is well.

you probably forgot the first part username password # server port
your company probably has the ip setup with username password

Fake Poor Internet

I'm trying to test my iPhone and Android application with poor internet. I remember there was a program I read about a while back that would fake different types of poor internet. Does anyone remember what this program was called or if there is something similar I can use to accomplish this task?

For iOS, as others have said, use the Network Link Conditioner settings under Settings > Developer > Network Link Conditioner.
For Android, just because nobody mentioned this...
use your iOS device to set up a personal hotspot
connect your Android device to the iOS hotspot
I put the Android device into Airplane mode, and then re-enable WiFi (or turn off cellular data, but I find these settings quicker for me to access on my device)
Use the iOS device's Network Link Conditioner settings to adjust the quality of the network
Since the Android device is tunneling through the iOS device's network, it'll be effected by the iOS device's network link conditioner settings.
Super easy, super awesome, and configurable.

The one that I use and recommend is Charles Proxy. You set it up so that your iPhone or Android uses it as the proxy. Then it can throttle your connection to simulate poor network conditions like 3G.
It has a lot of other useful features like being able to track and inspect all your HTTP requests and responses which is really helpful when writing apps that access web services.

For your iOS applications, Apple has a program called Network Link Conditioner for free for Lion users as part of xCode. For your Android apps, you can probably use Netlimiter.
Netlimiter: http://www.netlimiter.com/

A strategy to fake poor internet could be to open up sockets and send data as quickly as you can - the more threads that are doing this, the more of your device's internet access will be taken up, thus leaving less for the app. For example: if you have 1 other thread sending data, your bandwidth will be halved; if you have 3 other threads, only a quarter will be left for your application, and so on...
I imagine that this is the strategy employed by the program about which you read (although there are other ways in which this could be accomplished).

There's the Apple Link Conditioner which is included with all recent installs of the developer tools. It'll be in system preferences once it's installed.

How to connect few android devices?

There is restaurant, and I have wrote app for them. Now my task is to create device communication: only single app (on a single device) should work at one time. I.e. when user starts to use application on one device, apps on other devices should show warning "Please, wait...". How I can do this?
I am thinking about creating lock-file on some server (maybe on dropbox open folder???). At start app should look to this folder and if the lock file is exists - wait. If there isn't lock file - app will create it, performs all users tasks, delete lock file, and closes.
Another idea - is to use bluetooth connection... Maybe at starting app should seek for bluetooth device with special name... if it isn't - open bluetooth communication with that lock-name and begin to work... But the problem is the device os 1.6.

I think you're on the right track, but maybe a little far down the development path to think of this now.
Anyway, create an exclusive lock that you expose in a webservice you've deployed on apache (obviously, that service will also expose an unlock method too).
Use a local wifi network (one you install in the restaurant) with a tiny linux box and you're in business.