Haddii marka aad isku daydo in aad isticmaasho Xidhiidhka^{(use the Remote Desktop Connection)} Fog ee u dhexeeya labada kombiyuutarada Windows oo aad hesho fariinta khaladka ah - Ciladda Xiriirinta Fog , Cilad Xaqiijin ayaa dhacday, Shaqada la codsaday lama taageero^{(Remote Desktop Connection error, An Authentication error has occurred, The Function requested is not supported)} , markaa boostadan waxaa loogu talagalay inay ku caawiso. Maqaalkan, waxaan ku aqoonsan doonaa qaar ka mid ah sababaha la garan karo ee kicin kara qaladka ka dibna waxaan ku siin doonaa xalalka suurtagalka ah ee aad isku dayi karto inaad gacan ka geysato hagaajinta arrintan.

Marka xaqiijinta isku xirka Desktop-ka fog^{(Remote Desktop Connection)} uu guuldareysto, waxaad heli doontaa fariinta khaladka ah ee soo socota;

Remote Desktop Connection

An authentication error has occurred.
The function requested is not supported.

Remote computer: Computer_Name or IP_Address
This could be due to CredSSP encryption oracle remediation.
For more information, see https://go.microsoft.com/fwlink/?linkid=866660

Sida aad ka arki karto sawirka kore, fariinta khaladka ah waxaa keenay CredSPP Encryption Oracle Remediation . Waxaad hagaajin kartaa 'khalad sugitaan ah ayaa dhacay, Tani waxay u sabab noqon kartaa CredSSP encryption oracle remediation' adiga oo isticmaalaya Diiwaangelinta^(Registry) ama Tifaftiraha Siyaasadda Kooxda^{(Group Policy Editor)} .

Dhawaan Microsoft waxay ogaatay in nuglaanta fulinta koodka fog (CVE-2018-0886: encryption oracle attack) uu ku jiro noocyada CredSSP . Weeraryahan si guul leh uga faa'iidaysta nuglaantan waxa uu gudbin karaa aqoonsiga isticmaalaha si uu u fuliyo koodka nidaamka bartilmaameedka. Markaa codsi kasta oo ku xidhan CredSSP si loo xaqiijiyo waxa uu u nuglaaday weerarka noocaan ah.

Si loo daboolo khatartan amniga, Microsoft waxay^(Microsoft) soo saartay cusboonaysiin amni oo ka hadlaysa baylahda iyadoo saxaysa sida CredSSP u ansixiso codsiyada inta lagu jiro habka xaqiijinta. balastarku wuxuu cusboonaysiiyay borotokoolka xaqiijinta CredSSP iyo macaamiisha Desktop-^{(Remote Desktop)} ka fog ee dhammaan aaladaha ay saamaysay.

Ka dib markii la rakibo cusbooneysiinta, macaamiishii la dhejiyay way awoodi waayeen inay la xiriiraan serfarada aan la xirin. Si kale haddii loo dhigo, haddii kumbiyuutarka macmiilku uu ku rakiban yahay cusboonaysiinta amniga laakiin kumbuyuutarka server-ka aan lagu cusboonaysiin cusboonaysiinta amniga (ama caksigeeda), isku xirka fog waa lagu guul darreystay oo isticmaaluhu wuxuu helay farriin khalad ah oo kor lagu soo sheegay.

Khaladka xaqiijinta RDP^{(RDP Authentication)} waa dhacay, Shaqada^(Function) la codsaday lama taageero

Haddii aad la kulanto cilad ku xidhidhiyaha Desktop Fog, Khalad xaqiijineed ayaa dhacay, Shaqada la codsaday lama taageero^{(Remote Desktop Connection error, An Authentication error has occurred, The Function requested is not supported)} fariinta khaladka ah, waxaad isku dayi kartaa xalalkayaga hoose si aad u xalliso arinta.

1. Cusbooneysii^(Update) Windows 10 oo wata dhejisyadii ugu dambeeyay ee amniga
2. Wax ka beddel  siyaasadda sixitaanka Oracle sirta^{(Encryption Oracle Remediation)}
3. Abuur oo habee furaha diiwaanka AllowEncryptionOracle

Aan eegno sharraxaadda habka ku lug leh ee la xidhiidha mid kasta oo ka mid ah xalalka liiska.

1] Cusbooneysii Windows 10^{(Update Windows 10)} oo wata dhejisyadii ugu dambeeyay ee amniga

Xalkan, waxa lagugula talinayaa inaad ku rakibto bakhtiyaa-nasiib ee CredSSP^{(CredSSP security patch)} labadaba kombiyuutarada (server iyo macmiilka). Haddii kale, waxaad riixi kartaa Start > Settings > Update & Security > Windows Update > Hubi^{(Check for Updates)} cusboonaysiinta si aad u soo dejiso oo aad u rakibto cusboonaysiinta isu geynta ee ugu dambeysay.

Marka labada kombuyuutarba la rakibo balastar CredSSP , qaladka xaqiijinta ^(CredSSP)ayaa dhacay - Fariinta qaladka ee la codsado lama taageero^{(An Authentication error has occurred – The Function requested is not supported)} waa la xalin doonaa.

Haddii sababo qaar awgood, aadan ku rakiban karin cusbooneysiinta amniga ee server-ka ama kombiyuutarka macmiilka, waxaad isticmaali kartaa xalalka 2 iyo 3 ee hoose.

2] Wax ka beddel  siyaasadda Dib-u-habaynta Oracle sirta^{(Encryption Oracle Remediation)}

Fariinta khaladka ah waxaa lagu xallin karaa iyadoo la isticmaalo tifaftiraha Siyaasadda Kooxda^{(Group Policy)} si loo beddelo siyaasadda Sixitaan Oracle^{(Encryption Oracle Remediation)}  .

Fiiro gaar ah:^(Note:) Habkani ma khuseeyo Windows 10 Daabacaadda Guriga sababtoo ah ^(Home)Tifaftiraha Siyaasadda Kooxda Maxaliga ah^{(Local Group Policy Editor)} si caadi ah looguma rakibin. Laakiin waxaad ka shaqayn kartaa arrintan adiga oo ku daraya Tifaftiraha Siyaasadda Kooxda Maxalliga ah Windows 10 Daabacaadda Guriga^{(adding Local Group Policy Editor to Windows 10 Home edition)} .

Si aad awood ugu siiso siyaasadda Dib-u-habaynta Oracle Sireed^{(Encryption Oracle Remediation)} , samee waxa soo socda:

• Riix furaha Windows + R.
• Gudaha sanduuqa Runta ku qor gpedit.msc^(gpedit.msc) oo tabo Gelida si aad u furto Tifaftiraha Siyaasadda Kooxda^{(open Group Policy Editor)} .
• Gudaha Tifaftiraha Siyaasadda Kooxda Maxaliga ah^{(Local Group Policy Editor)} , isticmaal shayga bidix si aad ugu socotid jidka hoose:

Computer Configuration > Administrative Templates > System > Credentials Delegation

• Dhinaca midigta, laba-guji Sixitaan Oracle Remediation^{(Encryption Oracle Remediation)}  si aad wax uga beddesho hantideeda.
• Iyadoo la furay siyaasadda dib u hagaajinta Oracle^{(Encryption Oracle Remediation)} , u dhig badhanka raadiyaha si uu u shaqeeyo^(Enabled) .
• Marka xigta, hoos ugu dhaadhac  Heerka Ilaalinta^{( Protection Level)}  oo u beddel Nugul^(Vulnerable) .
• Guji Codso^(Apply) > OK si aad u kaydiso isbeddellada.

Hadda waxaad ka bixi kartaa Tifaftiraha Siyaasadda Kooxda Deegaanka^{(Local Group Policy Editor)} oo dib u bilaabi kartaa kombiyuutarkaaga. Bootka, isku day isku xirka RDP mar labaad oo arag haddii arrinta la xaliyay.

3] Abuur oo habee furaha diiwaangelinta AllowEncryptionOracle

Tani waxay la mid tahay awood siinta  siyaasadda Sixitaan Oracle ^{(Encryption Oracle Remediation )} . Waxaad xallin kartaa arrinta adiga oo abuuraya oo habaynaya furaha diiwaangelinta ee soo socda:

AllowEncryptionOracle: DWORD: 2

Maadaama uu kani yahay hawlgal diwaangelineed, waxaa lagugula talinayaa inaad kaydiso diiwaanka^{(back up the registry)}  ama  aad abuurto barta soo celinta nidaamka  haddii habsocodku xumaado.

Markaad qaadatid tallaabooyinka taxadarka ah ee lagama maarmaanka ah, waxaad ku socon kartaa sida soo socota:

• Riix furaha Windows + R.
• In sanduuqa Run Run, ku qor regedit^(regedit) oo tabo Gelida^(Enter) si aad u furto Registry Editor .
• U gudub ama u bood dariiqa furaha diiwaangelinta ee hoose:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System

• Midig-guji Nidaamka,^(System,) dooro Cusub^(New) > Furaha^(Key) oo u dhig magaciisa CredSSP.
• Marka xigta, midig-guji CredSSP, dooro Cusub^(New) > Furaha^(Key) oo u dhig magaceeda sida Parameters.
• Hadda, midig-guji meesha bannaan ee shayga midig ka dibna dooro Cusub^(New) > DWORD (32-bit) Qiimaha^{(DWORD (32-bit) Value)} .
• Dib ugu magacow magaca qiimaha sida AllowEncryptionOracle  oo ku dhufo Gelida.
• Laba jeer ku dhufo^{(Double-click)} qiimaha cusub si aad wax uga beddesho hantideeda.
• Geli 2 sanduuqa xogta qiimaha oo tabo ^(Value)Geli^(Enter) si aad u badbaadiso isbeddelka.
• Ka bax Tifaftiraha Diiwaanka^{(Registry Editor)} oo dib kuu bilaabo PC.

Hadda waa inaad awood u yeelatid inaad dhidibbada u taagto Isku-xidhka Mashiinka Fog^{(Remote Desktop Connection)} ee si guul leh!

Authentication error has occurred, Function requested is not supported

If when you try to use the Remote Desktop Connection between two Windows computers and you receive the error message – Remote Desktop Connection error, An Authentication error has occurred, The Function requested is not supported, then this post is intended to help you. In this post, we will identify some potential known causes that can trigger the error and then provide the possible solutions you can try to help remediate this issue.

When the Remote Desktop Connection authentication fails, you’ll receive the following error message;

Remote Desktop Connection

An authentication error has occurred.
The function requested is not supported.

Remote computer: Computer_Name or IP_Address
This could be due to CredSSP encryption oracle remediation.
For more information, see https://go.microsoft.com/fwlink/?linkid=866660

As you can see from the image above, the error message is caused by the CredSPP Encryption Oracle Remediation. You can fix the ‘An authentication error has occurred, This could be due to CredSSP encryption oracle remediation’ error by using Registry or Group Policy Editor.

Recently Microsoft found that a remote code execution vulnerability (CVE-2018-0886: encryption oracle attack) exists in CredSSP versions. An attacker who successfully exploits this vulnerability could relay user credentials to execute code on the target system. So any application that depends on CredSSP for authentication was vulnerable to this type of attack.

To patch this security risk, Microsoft released a security update addressing the vulnerability by correcting how CredSSP validates requests during the authentication process. The patch updated CredSSP authentication protocol and Remote Desktop clients for all affected platforms.

After installing the update, patched clients were not able to communicate with unpatched servers. In other words, if the client computer has the security update installed but the server computer was not updated with the security update (or vice versa), the remote connection was unsuccessful and user received above-mentioned error message.

RDP Authentication error has occurred, Function requested is not supported

If you’re faced with Remote Desktop Connection error, An Authentication error has occurred, The Function requested is not supported error message, you can try our recommended solutions below to resolve the issue.

1. Update Windows 10 with the latest security patches
2. Modify the Encryption Oracle Remediation policy
3. Create and configure the AllowEncryptionOracle registry key

Let’s take a look at the description of the process involved in relation to each of the listed solutions.

1] Update Windows 10 with the latest security patches

In this solution, it is recommended you install the CredSSP security patch in both computers (server and client). Alternatively, you can click Start > Settings > Update & Security > Windows Update > Check for Updates to download and install the latest cumulative update.

Once both computers have the CredSSP patch installed, the An Authentication error has occurred – The Function requested is not supported error message will be resolved.

If due to some reasons, you can’t install the security update in server or client computer, you can then use solutions 2 and 3 below.

2] Modify the Encryption Oracle Remediation policy

The error message can be resolved by using the Group Policy editor to modify the Encryption Oracle Remediation policy.

Note: This method does not apply to Windows 10 Home edition because the Local Group Policy Editor is not installed by default. But you can work around this issue by adding Local Group Policy Editor to Windows 10 Home edition.

To enable the Encryption Oracle Remediation policy, do the following:

• Press Windows key + R.
• In the Run dialog box type gpedit.msc and press Enter to open Group Policy Editor.
• Inside the Local Group Policy Editor, use the left pane to navigate to the path below:

Computer Configuration > Administrative Templates > System > Credentials Delegation

• On the right pane, double-click on Encryption Oracle Remediation to edit it’s properties.
• With the Encryption Oracle Remediation policy opened, set the radio button to Enabled.
• Next, scroll down to Protection Level and change it to Vulnerable.
• Click Apply > OK to save the changes.

You can now exit the Local Group Policy Editor and restart your computer. On boot, try the RDP connection again and see if the issue is resolved.

3] Create and configure the AllowEncryptionOracle registry key

This is the equivalent of enabling the Encryption Oracle Remediation policy. You can resolve the issue by creating and configuring the following registry key:

AllowEncryptionOracle: DWORD: 2

Since this is a registry operation, it is recommended that you back up the registry or create a system restore point in case the procedure goes wrong.

Once you have taken the necessary precautionary measures, you can proceed as follows:

• Press Windows key + R.
• In the Run dialog box, type regedit and press Enter to open Registry Editor.
• Navigate or jump to the registry key path below:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System

• Right-click System, select New > Key and set its name as CredSSP.
• Next, right-click CredSSP, select New > Key and set its name as Parameters.
• Now, right-click on the blank space on the right pane and then select New > DWORD (32-bit) Value.
• Rename the value name as AllowEncryptionOracle and hit Enter.
• Double-click on the new value to edit its properties.
• Input 2 in the Value data box and press Enter to save the change.
• Exit Registry Editor and restart you PC.

You should now be able to establish the Remote Desktop Connection successfully!

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