您好。请问您使用的EMQX是什么版本？报错前做过什么操作？方便的话，可以看下emqx日志。日志位置：emqx安装目录/log/emqx.log.*。谢谢
开源版5.2
2023-09-19T07:52:46.742701+00:00 [error] supervisor: ‘esockd_connection_sup - <0.2848.0>’, errorContext: connection_shutdown, reason: #{hint => invalid_proto_name,parsed_length => 256,remaining_bytes_length => 1}, offender: [{p
id,<0.3660.0>},{name,connection},{mfargs,{emqx_connection,start_link,[#{enable_authn => true,limiter => undefined,listener => {tcp,default},zone => default}]}}]
2023-09-19T07:53:25.990796+00:00 [warning] mfa: minirest_handler:apply_callback/3, line: 116, exception: error, path: /mqtt/retainer/messages, reason: badarg, stacktrace: [{ets,safe_fixtable,[emqx_retainer_message,true],[{error
_info,#{cause => id,module => erl_stdlib_errors}}]},{ets,‘-table/2-fun-4-’,2,[{file,“ets.erl”},{line,1488}]},{qlc,call,4,[{file,“qlc.erl”},{line,3806}]},{qlc,table_handle,3,[{file,“qlc.erl”},{line,2663}]},{qlc,setup_le,3,[{file
,“qlc.erl”},{line,2428}]},{qlc,setup_quals,6,[{file,“qlc.erl”},{line,2527}]},{qlc,setup_quals,4,[{file,“qlc.erl”},{line,2485}]},{qlc,setup_le,3,[{file,“qlc.erl”},{line,2424}]},{qlc,setup_le,3,[{file,“qlc.erl”},{line,2447}]},{ql
c,‘-cursor_process/7-fun-0-’,8,[{file,“qlc.erl”},{line,1066}]}]
2023-09-19T07:53:28.837109+00:00 [warning] mfa: minirest_handler:apply_callback/3, line: 116, exception: error, path: /mqtt/retainer/messages, reason: badarg, stacktrace: [{ets,safe_fixtable,[emqx_retainer_message,true],[{error
_info,#{cause => id,module => erl_stdlib_errors}}]},{ets,‘-table/2-fun-4-’,2,[{file,“ets.erl”},{line,1488}]},{qlc,call,4,[{file,“qlc.erl”},{line,3806}]},{qlc,table_handle,3,[{file,“qlc.erl”},{line,2663}]},{qlc,setup_le,3,[{file
,“qlc.erl”},{line,2428}]},{qlc,setup_quals,6,[{file,“qlc.erl”},{line,2527}]},{qlc,setup_quals,4,[{file,“qlc.erl”},{line,2485}]},{qlc,setup_le,3,[{file,“qlc.erl”},{line,2424}]},{qlc,setup_le,3,[{file,“qlc.erl”},{line,2447}]},{ql
c,‘-cursor_process/7-fun-0-’,8,[{file,“qlc.erl”},{line,1066}]}]
你好，请问这个是怎么出现的，可以复现么