List of common errors and how to fix them.
1. Remote connection refused because the specified username/password combination could not be recognized or the selected authentication protocol is not allowed on the server remote access. (Wrong login or password).
1) Invalid username or password.
Check if you have entered your username/password correctly. Please note that all characters written in the password must be entered. Also respect upper and lower case when writing the password.
Check if the address is correct VPN servers in settings
You need to recreate the vpn connection if retyping the login/password didn't help.
2) Login is already authorized on the server.
Try to connect after 5-10 minutes. If the connection fails, contact the user support department.
! Under no circumstances should you share your login details with anyone.
2. Remote connection not installed because the remote access server name could not be resolved. (No link). 
Possible causes of the error and how to fix it:
1) Check if it is enabled Network Card on your PC.
If the connection statuses local network disabled - enable by double-clicking the left mouse button.
2) Local area network connection (Ethernet) is crossed out with a red cross and below it is signed “Network cable is not connected”.
Check if connected network cable to the computer, if not, then it needs to be reconnected. If the connection fails, contact the user support department.
3. Failed to establish a network connection between the computer and the VPN server because the remote server is not responding. Possible reason: one of network devices between the computer and the remote server is not configured to allow VPN connections. To determine which device is causing this problem, contact your administrator or service provider. (Invalid server address). 
Possible causes of the error and how to fix it:
Check your VPN settings.
Launch the icon from the desktop "K-Telecom" and in the window that opens, click right click mice by connection. Select "View connection properties". Go to the "General" tab, the server name should be 172.16.0.1 or L2.
4. network folder not available. For information about troubleshooting problems on the network, see the help desk. Windows system. (Not received ip via dhcp). 
Possible causes of the error and how to fix it:
1) Check if the network card is receiving the network address.
Open: Control Panel - Network and Internet - Network and Sharing Center and public access- Change adapter settings. Right click on the "Ethernet" icon and select "Status". If the ip address starts with 169.254.xxx.xxx, then contact the customer support department.
2) Blocking antivirus program.
5. The remote connection was not established because the name of the remote access server could not be resolved. (There is no connection to DNS servers, DNS is registered manually, there is no ip address via dhcp). 
Possible causes of the error and how to fix it:
1) Incorrect LAN settings.
Check your LAN connection settings. Instructions for setting up a local network
2) Check if the network card is receiving the network address.
Open: Control Panel - Network and Internet - Network and Sharing Center - Change adapter settings. Right-click on the "Ethernet)" icon and select "Status". If the ip address starts with 169.254.xxx.xxx, then contact the customer support department.
3) Blocking by an antivirus program.
Make sure that a firewall or antivirus with a built-in firewall is not blocking the connection.
At iPhone update, iPad and iPod touch before the latest firmware, errors rarely occur, however, when a problem situation does arise, its solution can cause great difficulties. In this guide, we will look at one of the most common problems and tell you what to do if you could not contact the iPhone software update server.
An error with the text “Failed to communicate with the iPhone update server” can occur for several reasons at once, and accordingly, various actions may be required to solve the problem. Below we have looked at several ways to deal with this error.
1. Check if the computer has Internet access
Yes, it may sound trite, but sometimes the problem may be that at the time iTunes contacted the Apple software update server, your computer was not connected to the Internet. Therefore, before proceeding with active actions, once again make sure that your Mac or PC has Internet access.
2. Update iTunes to the latest version
Many iPhone owners, iPad and iPod touch use iTunes quite rarely and new versions of the multimedia processor sometimes pass by. But exactly old version iTunes may be causing an error when trying to update a mobile device.
Updating to the latest version of iTunes is very simple - you just need to go to the tab Reference and select item Updates, then confirm downloading and installing the latest version.
3. Reinstall iTunes
There are also situations that iTunes completely refuses to cooperate, even if the user has updated to the latest version. Then it only helps complete reinstallation iTunes, which is performed as follows.
Remove the following components in a specific order:
- iTunes
- Apple Software Update
- Apple Mobile Device Support
- Bonjour
- Apple Application Support (iTunes 9 or later)
After uninstalling, you must restart your computer and download the final version of iTunes from the official Apple website.
4. Edit the hosts file
On computers under Windows control the problem with the unavailability of Apple services may lie in a virus-infected hosts file. You can check it and, if necessary, edit it as follows:
Step 1: Go to C:\Windows\System32\Drivers\Etc
Step 2. Find host file and make a backup of it
Step 3. Open the hosts file with any text editor, for example, with standard Notepad (you need to open the editor on behalf of the administrator)
Step 4. Remove all lines from the hosts files containing the address gs.apple.com
Step 5: Save changes and restart your computer
5. Hard reset your iPhone
It is likely that the problem may not be in iTunes at all, but in mobile device. In order to check this, it is enough to perform a hard restart iPhone, iPad, or iPod touch by pressing the Power and Home buttons at the same time for a few seconds.
6. Try updating your iPhone on another computer
If none of the above helped, you should try updating to the latest version of iOS using a different computer.
Well, in very rare cases, it is to blame for the problem that arises. Apple company. Its software update servers may be in the process of technical work, or just "fall". The latter, however, happens only after the release of the largest updates.
In order for your brand new iPhone to always work correctly, you need to regularly update the branded operating system— iOS. New firmware versions eliminate all the shortcomings and problems of the previous ones, identified during operation - according to user reviews and comments. They also make the operation of devices more stable, faster and clearer. At the same time, the possibilities of both system applications are significantly expanded, and the potential of the hardware in the iPhone is fully revealed. Let's figure out how to update the iPhone correctly so that some unexpected error does not occur.
Before the procedure
If you are the owner of the version of the "six" with 16 gigabytes of memory, take care of the availability of sufficient free memory in advance. Keep in mind that even if there is enough space to download the archived folder with updates, then when it is unpacked and installed on the device, it will take a little more. Therefore, try to always leave a small backlog, in excess of the specified volume of the update package. If this is not done, an error may occur at any time. The download may be interrupted, the iPhone may freeze or get stuck in the recovery loop, and at best you will need to do everything again, at worst, forcefully restore the gadget, with a complete loss of data.
Therefore, remember the three main points that you must definitely do before updating iOS: make sure you have enough free space, update to the latest version of iTunes, and be sure to backups to your computer or iCloud.
This will minimize the risk of an unsuccessful update. And in the event of a system failure, you can restore all your data with virtually no loss.
In order to definitely eliminate the possibility of errors, it does not hurt to pre-update your computer's operating system, built-in security programs, as well as the installed antivirus. After that, restart your PC to apply all updates, and you can start downloading new firmware on the iPhone.
Update
There are two main ways to download and install updates. The first - from the iPhone itself, subject to a stable connection to the network via Wi-Fi, the second - using an authorized computer, in the menu of the proprietary program - iTunes.
The main differences between them are speed and convenience.
The first option is convenient because nothing is required except a smartphone and the Internet. The device will perform the entire procedure itself (if you choose this method, be sure to put your iPhone on charge - it is not known how long the download and installation will take). Loading iOS takes longer, because purely physically - the router distributing Wi-Fi makes the data transfer speed slow.
The second one is much faster, but you cannot do without a PC and a cable connection.
In order to update from the device itself, go from the settings menu to - General, and select the item - Software update.
After searching the web for the latest iOS updates- a suggestion will be displayed for downloading and installing them - to do this, click on the corresponding message below. 
Then confirm your agreement to the proposed terms of use. After that, you don’t need to do anything else, the iPhone will do everything by itself. Just wait for the process to finish. It is best to carry out this procedure in the evening, then the Internet speed is higher, and there are fewer people who want to download updates. And by the morning the smartphone will be ready for work.
As soon as a fresh update appears, iTunes will definitely notify you when connected. 
If you initiate this process yourself, connect the phone to the PC with a cable (preferably original), launch iTunes. In its menu, find your iPhone among devices. In the tab of synchronization settings and parameters - initiate the update. 
Everything, further processes will proceed automatically. The main thing is that the connection to the network is stable. After downloading the iOS update package, the installation will begin, during which the iPhone may restart repeatedly - this is normal.
But it happens that on your part all the conditions are met, but the iOS update fails. An error is persistently displayed, and there is no way to use the device.
Types and causes of errors
It happens that when you start the firmware update process, a system message like: “Failed to establish communication with the iPhone software update server” is displayed on the screen. First of all, check your device's Internet connection and rule out network problems. An error may also be generated if the cable malfunctions or is unsuitable (always use the proprietary one for firmware). Also try to troubleshoot the router by connecting the computer directly to the network.
In addition, it is quite possible that at this very moment Apple has temporary problems on the iOS activation servers. Do it again a little later. If you are still unable to connect to the iPhone software update server, try connecting to another PC with a different carrier network.
Sometimes the error occurs due to restrictions that are imposed installed antivirus or the computer's firewall, or a version mismatch between their updates. Therefore, install all the current databases (including those for the computer operating system), restart the PC and repeat the installation of the phone firmware.
In some cases, a software error is solved by the so-called. "hard" reboot. It will help if the smartphone has stopped responding to any user actions. To start it, simultaneously press and hold the buttons in this state for ten seconds - Home with Power. The screen of the gadget should turn off. After releasing the buttons, wait for the logo to appear in the center of the display. After that, press and immediately release Power again - the iPhone should boot in normal mode.
When the phone suddenly goes out, and there is no response to pressing the buttons, make sure that the battery of the device is not dead. Put it on charge just in case, and wait 10-15 minutes for it to gain enough power to start all systems. After that turn it on in the usual way, and repeat the update procedure.
If the above methods did not help, then most likely you will have to restore the device using iTunes or iCloud (we hope that, having listened to our advice, you have created copies of all important data). The procedure is similar to the update process, only when prompted, you need to select - Restore. When restoring, the iPhone should automatically install the latest firmware version.
Hello everyone, today we will consider what to do if it was not possible to establish a connection with the iPhone software update server?
One of the nicest features of today's mobile operating systems is over-the-air updates. Gone are the days when you had to manually download the firmware, install it using a special cable, and then further sharpen it for your device.
However, depend on remote server- also a pleasure with pitfalls. Apple servers, after the release of each update, withstand the influx of those who want to upgrade faster. What if I can't connect to the iPhone software update server?
First of all, check if there is an Internet connection at all. To do this, launch the browser, the client social network or other "network" program. If there is no connection, then the problem may be in your connection. Delete the connection in the Wi-Fi section and create it again. If this does not help, go to the router settings and switch the broadcast to the “b + g” hybrid mode.
If you are updating from a computer using iTunes, check that you are using the latest version of the program.
Not the freshest? Update. And for the future, activate automatic check for updates.
It is possible that malware has modified the hosts file. Recall that it is located in the C:\WINDOWS\SYSTEM32\DRIVERS\ETC folder. Open this file with Notepad. If it contains lines that mention apple.com, delete them.
It happens that everything is solved by a banal reboot of the computer or iPhone. Do not neglect this method (although, of course, rebooting is not a panacea).
Finally, errors happen on the Apple server itself, especially during the hottest hours after the release of fresh updates. Then it remains only to try a little later.
Whether you're using your iOS, Mac, or Windows device to connect to one of Apple's digital content stores, you might be plagued with "Unable to connect to iTunes Store' or 'Unable to connect to App Store". This can happen at any, even the most inconvenient moment when you are trying to use the App Store, the iBooks store, and even iTunes.
Can't connect to iTunes or the App Store on iOS: what to do
If you're having trouble connecting to the App Store, or any of Apple's other online digital content stores through any of your iOS devices, be it iPhone, iPod, or iPad. There may be many reasons why this is happening. Sometimes it can be a problem with wireless network, a disconnected internet cable, or it's because the drivers are not up to date. You can follow the steps below to help resolve these issues.
Check date and time settings
If the date and time on the device is turned off, Apple digital content stores will definitely not like it. To check your date and time settings, you need to do the following:
Make sure you have the latest version of iOS installed
Another thing you can check is to make sure your iOS version updated. To do this, check for updates, this can be done by following the instructions below.
Make sure you have a good data connection
If you are using Wi-Fi, make sure you are connected to the correct WiFi networks, by going to "Settings", and opening the "Wi-Fi" item, and also whether your signal is strong enough.
Checking the settings WiFi connections If you are using cellular communication, check if you have data cellular network configured in Settings > Cellular and make sure your signal is strong enough for a decent network connection. You should use LTE if possible, as it usually has the best data rates.
Enable the use of Cellular Disable active VPNs
If you are using a VPN that may be blocking Apple's Digital Content Stores, then you should disable the VPN immediately from Settings > VPN to see if you can connect or not. If everything works after you disable your VPN, then the VPN has been your problem all along.
Turn off VPN Do other devices on the same network have the same problem?
You can check if the problem is only with your device or if the problem is with Apple servers by checking another iOS device or another Mac or PC to see if those computers are also having connection problems. If the problem is present on all devices, then it is most likely that the Apple servers are out of service, and you should try again later.
Make sure there are no problems with the router.
You should never rule out what's wrong with your wireless router may have problems. If you see endless error messages, you can also try resetting your router, and thus resetting your internet connection, and that might solve the problem.
Can't Connect to iTunes or App Store on Mac
As on iOS devices, you may experience similar connection issues when using the Mac App Store, iBooks Store, or iTunes Store. Here are a few steps you can take to fix connection issues on your Mac.
Make sure your software is up to date
The Apple OS X operating system uses two key applications to connect to the network, namely, online digital content stores - Safari and iTunes. If you are using an outdated version of these software products, Apple may block their connection to digital content stores, in terms of security.
You can make sure both are up to date by launching the Mac App Store and clicking the Updates tab, then install updates if necessary.
Go to the "Updates" tab Make sure your firewall isn't blocking Apple Digital Content Stores
Mac users have access to firewall settings, but only for incoming connections. third party software a firewall such as LittleSnitch will allow you to block outgoing connections. Make sure your incoming and outgoing connections allow you to use the Mac App Store, iBooks, and iTunes.
To check for OS X firewall incoming connections, you can launch the System preferences app from the Menu Bar, then click on the Security & Privacy panel and open the Firewall tab. Here you can unlock the firewall settings and click the "Firewall Options" button to configure the allowed and blocked options.
Unblock firewall settings Make sure VPNs aren't blocking access
As with iOS, you can check to see if your Mac is connected to a VPN that might be restricting access. Generally, VPN software is accessed from the menu bar when it is in use.
Check if Mac is connected to VPN Reset your router or modem
Since Mac computers can use a wireless or wired internet connection, you can try resetting your wireless or wired router, this may fix the problem.
Sometimes, problems with the router can be the cause of iTunes Store and App Store connection errors.
Check Apple Server Status
To find out if the issue is with Apple servers and not Macs, visit the System Status web page and it will alert you to any malfunctioning Apple systems. If all items are marked green, then the problem is most likely related to your computer, and not to the servers.
Can't connect to iTunes or the App Store on Windows
If you're having trouble connecting to the iTunes Store on your Windows PC, you can follow some of the steps below and hopefully this will solve your problem:
Make sure iTunes is up to date
Since Apple is quite strict about updating software in a timely manner, the problem may be due to an unsupported version of iTunes. Make sure your computer has latest version iTunes.
Check network settings
Your network connection may be causing you to be unable to connect. Try to make sure you're connected to the correct Wi-Fi network, or check if your router is working. You can reset your router if necessary.
Make sure proxy or VPN is not giving you problems
As mentioned in the iOS and Mac troubleshooting steps above, VPN servers and proxy servers can cause connection issues with certain servers. Try disabling them and try connecting to the iTunes Store again.
Check your antivirus software
Some antivirus software may flag iTunes as a third-party unsafe program and may block its Internet access privileges. Since antivirus software is a common sight on Windows, this is a great place to check.
Check Apple Server Status
Just like Mac users, Windows users can visit the Apple Server Status web page to see if any of its services are disabled during a connection attempt.
iTunes and App Store connection errors can occur at the most awkward moment when you are trying to download new game or update the app, it's always a pain and anguish. Fortunately, and this problem is completely solvable, there are many ways to find the cause of its occurrence and effectively eliminate it.