Another error: ‘Application can’t be started… (Instant Passthru could not be resolved)’ caused by the CWA upgrade.

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A while ago, I wrote a blog about the error message ‘Application can’t be started… (Instant Passthru could not be resolved)’ that we encountered when launching a published application from our Ivanti Workspace Control managed session. Recently, we received the same message again, but this time the cause was different.

Application can’t be started… (Instant Passthru could not be resolved)

Shortly after a relatively simple task—upgrading an outdated version of Citrix Workspace App (CWA) from 1912 LTSR to the slightly newer 2203 LTSR—we encountered some inexplicable issues that made it impossible to launch Citrix Published Apps via SelfService.exe.

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How to Prevent SQL Database Locks and Improve Performance

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Within a large environment where Ivanti Workspace Control is used in combination with a Microsoft SQL Database, the SQL Server has to handle numerous connections initiated by all the Ivanti Workspace Control Agents.To minimize the load and connections on the SQL Server, Ivanti introduced the Ivanti Relay Servers, which act as proxies for all agent connections to the SQL Server, thereby reducing the total number of SQL connections and the overall load.

While monitoring our Ivanti Relay Server, we noticed that a couple of times a day, the Ivanti Relay Servers started queuing all messages. The transactions folder filled up with transactions that weren’t forwarded to the SQL Server. The Ivanti Relay Servers have a built-in failsafe option, where they stop accepting new transactions when the queue exceeds 50,000 transactions. So, in a short period of time, all Ivanti Relay Servers went offline because they hit the 50,000 transaction threshold.

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