Virtual Application Launch Failure with error "The published resource is not available currently"

Virtual Application Launch Failure with error "The published resource is not available currently"

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Article ID: CTX482348

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Updated On:

Description

Launch virtual app failure via Gateway with error :"The published resource is not available currently"
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Resolution

Implementation of either solutions below to fix this issue: 

Solution 1: Checking VDA EDT settings and allow UDP:1494/2598 traffic from NetScaler to VDA servers.
Solution 2: Disable HDX Adaptive Transport in Studio and Disable "DTLS" on NetScaler Gateway Virtual Server .

Problem Cause

UDP 1494/2598 is blocked NetScaler and the VDA server or VDA server is not listening on UDP 1494/2598 port.

Troubleshooting details:
  1. Client download ICA file successfully and senD STA ticket verification request to NetScaler Gateway, then NetScaler Gateway verified the STA ticket with STA server. The STA server provided valid VDA server's info(IP+Port) that actively waiting served.
  2. After that there was some communication between the client and Citrix Gateway, which was based on DTLS(SSL+UDP).
  3. But UDP 1494/2598 ICA connection build up failure between NetScaler Gateway and VDA server.
  4. Then the client fallback to TCP connection and established a new TLS(SSL+TCP) connection with Citrix Gateway and sent the STA ticket verification request with the same STA ticket number to Citrix Gateway. After Gateway forwarded the request to STA server, STA server responded "Invalid-ticket". This error was because the same ticket was verified twice.
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