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The connection to a Credential Store requires random numbers to encrypt the connection. Java releases before 12 use the /dev/random file for high quality of randomness. However, when the entropy pool is is falling falls below the number of 64 units then /dev/random will block while reading random numbers.

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To verify the entropy pool being the root cause of this issue try this (requires root permission):

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There are two alternative solutions: to modify modifying the Java security settings or to modify modifying the Java options in use.

Both solutions apply to Unix and Windows operating systems.

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JAVA_OPTIONS="-Djava.security.egd=file:///dev/urandom"

Find further information from Further information can be found in the JS7 - How To - Apply Java Options article.