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|Component||Checks & Agents|
|Title||check_mk_agent.linux, check_mk_agent.openwrt: specify message digest for encrypted agent output explicitly|
|Checkmk Edition||Checkmk Raw Edition (CRE)|
|Compatibility||Compatible - no manual interaction needed|
For encrypted agent output the default message digest algorithm of OpenSSL was used before. Prior to OpenSSL 1.1 the default is MD5 which is what the Check_MK server is expecting as well. Starting from OpenSSL 1.1. the default message digest algorithm changed to SHA-256 which leads to problems in the communication between hosts with a new OpenSSL version and the Check_MK server. Now the message digest algorithm is specified explicitly as MD5 to circumvent any ambiguity.