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What causes the error "Security: 149 - digest check failed, SSL Connect" when loadtesting an Apache Web Server?

What causes the error "Security: 149 - digest check failed, SSL Connect" when loadtesting an Apache Web Server?

The "digest check failed" error is caused by the way Apache mod_ssl handles SSL sessions when under load. There is a setting in Apache to workaround the digest error, located in the "HTTPD.CONF" configuration file.

By default SSLSessionCache is not set which disables the global/inter-process Session Cache.

Setting SSLSessionCache should resolve the "Security: 149 - digest check failed, SSL Connect" error.

 SSLSessionCache dbm:logs/ssl_gcache_data 

from mod_ssl help - http://www.modssl.org/docs/2.8/ssl_reference.html:

dbm:/path/to/datafile

"This makes use of a DBM hashfile on the local disk to synchronize the local OpenSSL memory caches of the server processes. The slight increase in I/O on the server results in a visible request speedup for your clients, so this type of storage is generally recommended."

It is recommended you discuss this issue with your server administrator before proceeding.

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