Hostname couldn't be resolved error on some PCs - vb.net

Question

So I have a big web browser project and everything seems to be working just fine.
I have a feature which allows the user to get news about my website when they click a specific button.
The way this is supposed to work is it is going to read text out of a txt file in my dropbox and then display that text in a richtextbox in my application.
The way I did is that I simply uploaded a txt file into my Dropbox folder and gave it a name which never changes so as to work with my code , and then I copied the share link of this file and put it inside my code.
Now whenever I want to update my news , all I have to do is to just edit the txt file in my Dropbox folder , keeping the same file name so the link stays the same and doesn't change thus allowing my application to correctly update the news.
I tested this on my Laptop (which I do all the programming on) and it worked great. I tested this on my old desktop PC and it worked great. I had some friends from different countries around the world test this and this where the problem happens ... it worked great for some of them and for the others it failed and gave an error ... (Hostname couldn't be resolved)
Not only this makes the news function in my application not useable , but it also makes the auto update function i have not useable as well because it also uses the same method.
Now let's jump into the code and please help find out what the problem is ...
The following are the main code that works on downloading a file from Dropbox:
Private Sub Download_Dropbox(URL As String, FileName As String)
Dim Data() = HTTP_Get(URL)
File.WriteAllBytes(FileName, Data)
End Sub
Private Function HTTP_Get(Page As String) As Byte()
Dim Request As HttpWebRequest = WebRequest.Create(Page)
Request.Method = "GET"
Request.KeepAlive = True
Request.ContentType = "application/x-www-form-urlencoded"
Request.UserAgent = "Mozilla/5.0 (Windows NT 6.3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.154 Safari/537.36"
Request.AllowAutoRedirect = True
Dim Response As HttpWebResponse = Request.GetResponse()
Dim Data As Stream = Response.GetResponseStream()
Dim Bytes() As Byte
Using Writer As New MemoryStream
Dim Buffer(&HFFF) As Byte
Do
Dim BytesRead As Long = Data.Read(Buffer, 0, Buffer.Length)
If BytesRead > 0 Then Writer.Write(Buffer, 0, BytesRead) Else Exit Do
Loop
Bytes = Writer.ToArray()
End Using
Return Bytes
End Function
and this is the code for the button that tries to update the news (reads a txt file):
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
If Form1.IsConnectionAvailable = True Then
Try
'Download_Dropbox("https://www.dropbox.com/s/8m2apm0x0rh91e0/orbitnews.txt?dl=1", CurDir & "\orbitnews.txt")
Dim ABC As String
Dim myWebClient As New System.Net.WebClient
Dim file As New System.IO.StreamReader(myWebClient.OpenRead("https://www.dropbox.com/s/8m2apm0x0rh91e0/orbitnews.txt?dl=1"))
ABC = file.ReadToEnd
file.Close()
newsshower.Text = ABC
My.Settings.oldnews = ABC
dater.Text = (DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss"))
My.Settings.newsrefdate = dater.Text
My.Settings.Save()
Timer1.Enabled = True
Label2.Visible = True
If newsshower.Text.Contains("Click the button below to update your browser now!") Then
If newsshower.Text.Contains(Application.ProductVersion) Then
My.Settings.newsupdate = False
updatetoggler.Visible = False
Else
updatetoggler.Visible = True
My.Settings.newsupdate = True
My.Settings.Save()
End If
End If
Catch ex As Exception
MsgBox("An error has occured while refreshing news." & vbCrLf & "Please contact customer support and send them the following:" & vbCrLf & ex.ToString & vbCrLf & vbCrLf & "Customer Support E-mail:" & vbCrLf & "omaradoinc#hotmail.com")
End Try
Else
MsgBox("You aren't connected to the internet." & vbCrLf & "Please connect to the internet to be able to refresh the news.")
End If
End Sub
and this is the code that downloads files from Dropbox (which shouls happen when the programs works on updating itself):
Public Sub mainupdate()
Download_Dropbox("https://www.dropbox.com/s/eomar7a70hokm0l/Orbit.exe?dl=1", CurDir & "\Orbit.exe")
Download_Dropbox("https://www.dropbox.com/s/ij1qceoe5kr6tmp/Orbit.exe.config?dl=1", CurDir & "\Orbit.exe.config")
Download_Dropbox("https://www.dropbox.com/s/em4mo4lsoswba4p/Orbit.pdb?dl=1", CurDir & "\Orbit.pdb")
Download_Dropbox("https://www.dropbox.com/s/g0361qpzvq74ge4/Orbit.vshost.exe?dl=1", CurDir & "\Orbit.vshost.exe")
Download_Dropbox("https://www.dropbox.com/s/o5bbkn72cbs9bo7/Orbit.vshost.exe.config?dl=1", CurDir & "\Orbit.vshost.exe.config")
Download_Dropbox("https://www.dropbox.com/s/wzsyzjczibwa9sz/Orbit.xml?dl=1", CurDir & "\Orbit.xml")
Download_Dropbox("https://www.dropbox.com/s/l0ogz6kxrn951zv/OWBV.txt?dl=1", CurDir & "\OWBV.txt")
End Sub
Public Sub othersupdate()
Download_Dropbox("https://www.dropbox.com/s/lyv0kdmpi85rbdp/libzplay.dll?dl=1", CurDir & "\libzplay.dll")
End Sub
Public Sub soundsupdate()
Download_Dropbox("https://www.dropbox.com/s/hfl1vidanwecad4/not.wav?dl=1", CurDir & "\not.wav")
Download_Dropbox("https://www.dropbox.com/s/cfroifknr8zmnub/pokked.wav?dl=1", CurDir & "\pokked.wav")
Download_Dropbox("https://www.dropbox.com/s/c73af0a30hxg7gp/screenshotsound.wav?dl=1", CurDir & "\screenshotsound.wav")
Download_Dropbox("https://www.dropbox.com/s/ps5ztudy9cwvwnl/timerend.wav?dl=1", CurDir & "\timerend.wav")
End Sub
Private Sub Download_Dropbox(URL As String, FileName As String)
Dim Data() = HTTP_Get(URL)
File.WriteAllBytes(FileName, Data)
End Sub
and this is the code for IsConnectionAvailable() in Form1 :
Public Function IsConnectionAvailable() As Boolean
Dim objUrl As New System.Uri("http://www.google.com")
Dim objWebReq As System.Net.WebRequest
objWebReq = System.Net.WebRequest.Create(objUrl)
Dim objresp As System.Net.WebResponse
Try
objresp = objWebReq.GetResponse
objresp.Close()
objresp = Nothing
Return True
Catch ex As Exception
objresp = Nothing
objWebReq = Nothing
Return False
End Try
End Function
and this is the whole code for my update client which completely failes to download any files from Dropbox or read text:
Option Explicit On
Imports System.IO
Imports System.Net
Imports System.Net.Sockets
Public Class Form1
Dim Listener As New TcpListener(8000)
Dim Client As TcpClient
Dim CurDir As String = My.Application.Info.DirectoryPath
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
updatecheck()
End Sub
Private Sub helper_Click(sender As Object, e As EventArgs) Handles helper.Click
helpform.Show()
End Sub
Public Sub mainupdate()
Download_Dropbox("https://www.dropbox.com/s/eomar7a70hokm0l/Orbit.exe?dl=1", CurDir & "\Orbit.exe")
Download_Dropbox("https://www.dropbox.com/s/ij1qceoe5kr6tmp/Orbit.exe.config?dl=1", CurDir & "\Orbit.exe.config")
Download_Dropbox("https://www.dropbox.com/s/em4mo4lsoswba4p/Orbit.pdb?dl=1", CurDir & "\Orbit.pdb")
Download_Dropbox("https://www.dropbox.com/s/g0361qpzvq74ge4/Orbit.vshost.exe?dl=1", CurDir & "\Orbit.vshost.exe")
Download_Dropbox("https://www.dropbox.com/s/o5bbkn72cbs9bo7/Orbit.vshost.exe.config?dl=1", CurDir & "\Orbit.vshost.exe.config")
Download_Dropbox("https://www.dropbox.com/s/wzsyzjczibwa9sz/Orbit.xml?dl=1", CurDir & "\Orbit.xml")
Download_Dropbox("https://www.dropbox.com/s/l0ogz6kxrn951zv/OWBV.txt?dl=1", CurDir & "\OWBV.txt")
End Sub
Public Sub othersupdate()
Download_Dropbox("https://www.dropbox.com/s/lyv0kdmpi85rbdp/libzplay.dll?dl=1", CurDir & "\libzplay.dll")
End Sub
Public Sub soundsupdate()
Download_Dropbox("https://www.dropbox.com/s/hfl1vidanwecad4/not.wav?dl=1", CurDir & "\not.wav")
Download_Dropbox("https://www.dropbox.com/s/cfroifknr8zmnub/pokked.wav?dl=1", CurDir & "\pokked.wav")
Download_Dropbox("https://www.dropbox.com/s/c73af0a30hxg7gp/screenshotsound.wav?dl=1", CurDir & "\screenshotsound.wav")
Download_Dropbox("https://www.dropbox.com/s/ps5ztudy9cwvwnl/timerend.wav?dl=1", CurDir & "\timerend.wav")
End Sub
Private Sub Download_Dropbox(URL As String, FileName As String)
Dim Data() = HTTP_Get(URL)
File.WriteAllBytes(FileName, Data)
End Sub
Private Function HTTP_Get(Page As String) As Byte()
Dim Request As HttpWebRequest = WebRequest.Create(Page)
Request.Method = "GET"
Request.KeepAlive = True
Request.ContentType = "application/x-www-form-urlencoded"
Request.UserAgent = "Mozilla/5.0 (Windows NT 6.3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.154 Safari/537.36"
Request.AllowAutoRedirect = True
Dim Response As HttpWebResponse = Request.GetResponse()
Dim Data As Stream = Response.GetResponseStream()
Dim Bytes() As Byte
Using Writer As New MemoryStream
Dim Buffer(&HFFF) As Byte
Do
Dim BytesRead As Long = Data.Read(Buffer, 0, Buffer.Length)
If BytesRead > 0 Then Writer.Write(Buffer, 0, BytesRead) Else Exit Do
Loop
Bytes = Writer.ToArray()
End Using
Return Bytes
End Function
Public Function IsConnectionAvailable() As Boolean
Dim objUrl As New System.Uri("http://www.google.com")
Dim objWebReq As System.Net.WebRequest
objWebReq = System.Net.WebRequest.Create(objUrl)
Dim objresp As System.Net.WebResponse
Try
objresp = objWebReq.GetResponse
objresp.Close()
objresp = Nothing
Return True
Catch ex As Exception
objresp = Nothing
objWebReq = Nothing
Return False
End Try
End Function
Public Sub updatecheck()
Try
If IsConnectionAvailable() = True Then
Dim request As System.Net.HttpWebRequest = System.Net.HttpWebRequest.Create("http://pastebin.com/wCt79dEc")
Dim response As System.Net.HttpWebResponse = request.GetResponse()
Dim sr As System.IO.StreamReader = New System.IO.StreamReader(response.GetResponseStream())
Dim newestversion As String = sr.ReadToEnd()
Dim fileContents As String
Try
fileContents = My.Computer.FileSystem.ReadAllText(CurDir & "\OWBV.txt")
If newestversion.Contains(fileContents) Then
updater.Enabled = False
Else
End If
Catch ex As Exception
MsgBox("Orbit version file not found. Update button disabled." & "You can do one of the following 2 methods to fix this error. (Administrator rights might be required)" & vbCrLf & "1- Please open Orbit and then head to (Settings) , then check the option (Enable Console) and save changes. " & vbCrLf & "2- Open (File) Menu and launch (Browser Console)" & vbCrLf & "3- Type in the following command without the brackets: ( /vfcreate ) and then press Enter on your keyboard." & vbCrLf & "If the process is successful , then please launch the update client again either through Orbit itself or close Orbit and launch it manually by running (OWBUpdater.exe) in the application directory. " & vbCrLf & "If the process isn't successful , then please contact customer support at: omaradoinc#hotmail.com" & vbCrLf & "The other method to fix this error is:" & vbCrLf & "1- Navigate to Orbit Installation directory/folder." & vbCrLf & "2-Create a notepad (.txt file) and name that file the following name without the brackets: (OWBV)" & vbCrLf & "3- Open the file and type Orbit's old version that you have or as instructed by customer support , save the changes." & vbCrLf & "If you fail to fix this error , please contact customer support at:" & vbCrLf & "omaradoinc#hotmail.com")
updater.Enabled = False
End Try
Else
updater.Enabled = False
repairer.Enabled = False
intnot.Visible = True
Me.Text = "Orbit Web Browser Update Client (No Internet connection)"
End If
Catch ex As Exception
MsgBox("An Error Has Occured While Checking For Updates..." & vbCrLf & "This May Happen Because Of a Load On The Server" & vbCrLf & "Please Try Again Later" & vbCrLf & "If The Problems Still Exists Then Please Report This To:" & vbCrLf & "omaradoinc#hotmail.com")
End Try
End Sub
Private Sub updater_Click(sender As Object, e As EventArgs) Handles updater.Click
Try
m1.Visible = False
m2.Visible = False
progressor.Visible = True
Me.Enabled = False
mainupdate()
Process.Start(CurDir & "\Orbit.exe")
MsgBox("Orbit was successfully updated to the latest version.")
Me.Close()
Catch ex As Exception
m1.Visible = True
m2.Visible = True
progressor.Visible = False
Me.Enabled = True
My.Computer.FileSystem.WriteAllText(CurDir & "\errorlog.txt", ex.ToString, True)
MsgBox("Update failed." & vbCrLf & "A log file was created in the application directory , Please send it to customer support at:" & vbCrLf & "omaradoinc#hotmail.com")
End Try
End Sub
Private Sub repairer_Click(sender As Object, e As EventArgs) Handles repairer.Click
Try
m1.Visible = False
m2.Visible = False
progressor.Visible = True
Me.Enabled = False
othersupdate()
soundsupdate()
Process.Start(CurDir & "\Orbit.exe")
MsgBox("Orbit was successfully repaired.")
Me.Close()
Catch ex As Exception
m1.Visible = True
m2.Visible = True
progressor.Visible = False
Me.Enabled = True
My.Computer.FileSystem.WriteAllText(CurDir & "\errorlog.txt", ex.ToString, True)
MsgBox("Repair failed." & vbCrLf & "A log file was created in the application directory , Please send it to customer support at:" & vbCrLf & "omaradoinc#hotmail.com")
End Try
End Sub
Private Sub remover_Click(sender As Object, e As EventArgs) Handles remover.Click
Try
Listener.Start()
m1.Visible = False
m2.Visible = False
progressor.Visible = True
My.Computer.FileSystem.WriteAllText(CurDir & "\uninstcmd.txt", "cmd:/send\performfactoryreset", True)
Timer1.Enabled = True
Timer1.Start()
Process.Start(CurDir & "\Orbit.exe")
updater.Enabled = False
repairer.Enabled = False
remover.Enabled = False
Catch ex As Exception
Listener.Stop()
Timer1.Stop()
Timer1.Enabled = False
m1.Visible = True
m2.Visible = True
progressor.Visible = False
MsgBox("Orbit.exe wasn't found." & vbCrLf & "Unable to complete uninstallation.")
End Try
End Sub
Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
Dim Message As String
Dim nStart As Integer
Dim nLast As Integer
If Listener.Pending = True Then
Message = ""
Client = Listener.AcceptTcpClient
Dim Reader As New StreamReader(Client.GetStream())
While Reader.Peek > -1
Message &= Convert.ToChar(Reader.Read()).ToString
End While
If Message.Contains("</>") Then
nStart = InStr(Message, "</>") + 4
nLast = InStr(Message, "<\>")
Message = Mid(Message, nStart, nLast - nStart)
End If
If Message.Contains("cmd:/send\completedfactoryreset") Then
Try
My.Computer.FileSystem.WriteAllText(CurDir & "\uninstcmd.txt", "Nothing here.", True)
MsgBox("Orbit settings have been successfully cleaned." & vbCrLf & "Thanks for using Orbit , This client will now exit and launch the main uninstaller which will completely remove Orbit from your PC." & vbCrLf & "For customer support , Contact: omaradoinc#hotmail.com")
Process.Start(CurDir & "\Uninstal.exe")
Me.Close()
Catch ex As Exception
MsgBox("Orbit settings have been successfully cleaned." & vbCrLf & "Thanks for using Orbit , This client will now exit and launch the main uninstaller which will completely remove Orbit from your PC." & vbCrLf & "For customer support , Contact: omaradoinc#hotmail.com")
Process.Start(CurDir & "\Uninstal.exe")
Me.Close()
End Try
End If
End If
End Sub
End Class
For now I can't remember the line where the error was but i will try to get my friends to retest and get the exact error as i have setup my application with lots of Try Catch blocks and easy ways to grab the errors in txt files and send them to me so it shouldn't be much of a hassle before i can get the full error.
For now is there anything that seems out of space or could be improved to work better?