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From ios logs:
System.ObjectDisposedException: The object was used after being disposed.
at System.Net.WebConnection.EndRead (System.Net.HttpWebRequest request, IAsyncResult result) [0x0001f] in /Developer/MonoTouch/Source/mono/mcs/class/System/System.Net/WebConnection.cs:943
at System.Net.WebConnectionStream.EndRead (IAsyncResult r) [0x0003c] in /Developer/MonoTouch/Source/mono/mcs/class/System/System.Net/WebConnectionStream.cs:405
System.InvalidOperationException: The underlying Task is already in one of the three final states: RanToCompletion, Faulted, or Canceled.
at System.Threading.Tasks.TaskCompletionSource`1[System.Int32].SetException (IEnumerable`1 exceptions) [0x00000] in <filename unknown>:0 (code.cs:1)
at System.Threading.Tasks.TaskCompletionSource`1[System.Int32].SetException (System.Exception exception) [0x00000] in <filename unknown>:0 (code.cs:1)
at System.Threading.Tasks.TaskFactory`1[System.Int32].InnerInvoke (System.Threading.Tasks.TaskCompletionSource`1 tcs, System.Func`2 endMethod, IAsyncResult l) [0x00000] in <filename unknown>:0 (code.cs:1)
at System.Threading.Tasks.TaskFactory`1+<FromAsyncBeginEnd>c__AnonStorey5`3[System.Int32,System.Byte,System.Int32,System.Int32].<>m__0 (IAsyncResult l) [0x00000] in <filename unknown>:0 (code.cs:1)
at System.Net.WebAsyncResult.CB (System.Object unused) [0x00000] in <filename unknown>:0 (code.cs:1)
7.0.5 and 4.10.2 are completely okay :)
I believe this issue is resolved in master
Android issue reproduces on 4.12.3
4.12.3 is not tracking latest mono but some 6 months old version. You need to wait for XA update