We did the same for 4.2.8 and got this:
Feb 8 12:13:38 pid:130386 ERROR: Agent [130386] exiting with status = -4000
Feb 8 12:13:38 pid:130315 ERROR: Agent process [130386] exited with status [96]
Feb 8 12:13:39 pid:130390 remote addresses: ERROR: [-] /irods_git_repo/server/core/src/rsApiHandler.cpp:541:int readAndProcClientMsg(rsComm_t *, int) : status [SYS_HEADER_READ_LEN_ERR] errno [] -- messa$
[-] /irods_git_repo/lib/core/src/sockComm.cpp:201:irods::error readMsgHeader(irods::network_object_ptr, msgHeader_t *, struct timeval *) : status [SYS_HEADER_READ_LEN_ERR] errno [] -- message [failed to call 'read header']
[-] /irods_git_repo/plugins/network/tcp/libtcp.cpp:194:irods::error tcp_read_msg_header(irods::plugin_context &, void *, struct timeval *) : status [SYS_HEADER_READ_LEN_ERR] errno [] -- message [only read [0] of [4]]
Feb 8 12:13:39 pid:130390 ERROR: Agent [130390] exiting with status = -4000
Feb 8 12:13:39 pid:130315 ERROR: Agent process [130390] exited with status [96]
Feb 8 12:15:48 pid:130485 remote addresses: ERROR: msiSetRescSortScheme is no longer supported, please use a resource composition of a similar type
Feb 8 12:15:48 pid:130485 remote addresses: ERROR: executeRuleAction Failed for msiSetRescSortScheme status = -66000 SYS_NOT_SUPPORTED