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Knowledge Base

Provision of linked clone virtual machines fails with error: 'Fail to connect to the UFA service' (52772)

Last Updated: 1/17/2023Categories: TroubleshootingTotal Views: 7446Language:
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Symptoms

Important: We recommend you migrate from Horizon 7 to Horizon 8 as soon as possible. Horizon 8 offers numerous improvements in performance, scale, and experience for both Administrators and end users. Please see Ensuring a successful migration from Horizon 7 to Horizon 8 (89840)  for additional advice.

Provision of linked clone virtual machines fail with error: Fail to connect to the UFA service or Disk Management Service not available.

In the C:\ProgramData\VMware\View Composer\Logs\ you see the entries similar to:

| WFE thread 1 | FATAL | CommonLib.UfaSubsystem.UfaSubsystem - Fail to connect to the UFA service at https://localhost:49885/
WFE thread 1 | FATAL | ServiceCore.Action.UfaInitializeDiskAction - Disk custom error: fail to invoke InitializeDisk.
VMware.Sim.CommonLib.Exception.SimUfaSubsystemException: Fail to connect to the UFA service at https://localhost:49885/ ---> System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a send. ---> System.IO.IOException: Received an unexpected EOF or 0 bytes from the transport stream.

In the C:\ProgramData\VMware\View Composer\UFA Logs\, you see entries similar to:

Vmacore::Http::HttpSvcImpl::AcceptHttpConn accept failure - no read scheduled: ,SSL Exception: error:1408A0C1:SSL routines:SSL3_GET_CLIENT_HELLO:no shared cipherclass Vmacore::Exception *
Vmacore::Http::HttpSvcImpl::AcceptHttpConn stream is NULL - no read scheduled

Cause

The composer and UFA service reside in the same box and communicate via TLS1.2. The composer service uses the windows channel service to pick up its cipher suites. Sometimes, because of installation of certain patches, some ciphers suits may be disabled in windows and the initial handshake between composer and UFA may fail.

Resolution

To resolve the issue, follow below steps:

Open RUN window

Type  gpedit.msc

Navigate to  Computer Configuration -> Administrative Template-> Network -> SSL Configuration-> SSL Cipher Suite Order and set it to 'Enable'

Add the below cipher suites in the editbox:

TLS_RSA_WITH_AES_128_CBC_SHA256,
TLS_RSA_WITH_AES_128_CBC_SHA,
TLS_RSA_WITH_AES_256_CBC_SHA256,
TLS_RSA_WITH_AES_256_CBC_SHA,
TLS_RSA_WITH_RC4_128_SHA,
TLS_RSA_WITH_3DES_EDE_CBC_SHA,
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256,
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P384,
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA_P256,
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA_P384,
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA_P256,
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA_P384,
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256_P256,
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256_P256,
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384_P384,
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384_P384,
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA_P256,
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA_P384,
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA_P256,
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA_P384,
TLS_DHE_DSS_WITH_AES_128_CBC_SHA256,
TLS_DHE_DSS_WITH_AES_128_CBC_SHA,
TLS_DHE_DSS_WITH_AES_256_CBC_SHA256,
TLS_DHE_DSS_WITH_AES_256_CBC_SHA,
TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA,
TLS_RSA_WITH_RC4_128_MD5,
SSL_CK_RC4_128_WITH_MD5,SSL_CK_DES_192_EDE3_CBC_WITH_MD

Below is the way to add the cipher suits in the editbox :

Open a blank notepad document.

Copy and paste the list of available suites into it.

Arrange the suites in the correct order; remove any suites you don't want to use.

Place a comma at the end of every suite name except the last. Make sure there are NO embedded spaces.

Remove all the line breaks so that the cipher suite names are on a single, long line.

Copy the cipher-suite line to the clipboard, then paste it into the edit box. The maximum length is 1023 characters.

After adding these cipher suites TLS handshake between UFA and Composer will pass.

Detectable by VMware SkylineTM

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