9.运行场景时提示“Step download timeout (120 seconds) has expired when downloading resource(s)”
vuser_init.c(12): Error -27728: Step download timeout (120 seconds) has expired when downloading non-resource(s)（出现个别，可以忽略）
vuser_init.c(12): Error -27727: Step download timeout (120 seconds) has expired when downloading resource(s). Set the "Step Timeout caused by resources is a warning" Run-Time Setting to Yes/No to have this message as a warning/error, respectively
如果觉得下载一个页面超过2分钟不是错误的话，可以在Run-Time设置中选择Preferences->Options，修改Step download timeout(sec)的时间
或者把“Step timeout caused by resources is a warning”设置为Yes，这样下载资源超时也只是作为警告，不作为错误提示。
但是对于非资源的下载超时，用LoadRunner测试时，总会报下载超时的错误:
vuser_init.c(26): Error -27727: Step download timeout (120 seconds) has expired when downloading resource(s). Set the "Step Timeout caused by resources is a warning" Run-Time Setting to Yes/No to have this message as a warning/error, respectively
上面报的是超时的意思，不一定是代码的问题，可能是负载比较大，服务器的响应超过了120秒，就汇报这个错误，解决方法如下：
1、 修改run time setting中的请求超时时间，默认120，你改大一些,其中有三项的参数可以一次都修改了，HTTP-request connect timeout，HTTP-request receieve timeout，Step download timeout，分别建议修改为600、600、5000；run time setting设置完了后记住还需要在control组件的option的run time setting中设置相应的参数；
2、 设置run time setting中的internet protocol-preferences中的advaced区域有一个winlnet replay instead of sockets选项，勾选。
5. Abnormal termination, caused by mdrv process termination
解决：
大胆尝试了修改了LR中的D:\Program Files\Mercury\LoadRunner\dat\protocols 中的http.lrp信息，在[Vugen]下面新加一条MaxThreadPerProcess=要设置的vuser数量 。
Message Code 27979
Requested form not found
The form was not found in the page received from the server. Possible reasons: (i) The current or a previous HTML page was changed after the script was recorded. (ii) A previous request navigated to a wrong page or failed. (iii) One or more web_submit_form arguments are missing or incorrect (especially for manually coded, parameterized, or correlated functions). (iv) The server returned an unexpected page (e.g., under excessive load).
Troubleshooting
If the current or previous HTML page was changed, look for the correct properties of the form used in the text (e.g., action), and change it in the script.
If your snapshots and extended log are disabled, enable them and run the script again.
(i) To enable Snapshots: Select Tools > General Options > Correlation, and check the Save correlation information during replay box.
(ii) To enable Extended Log: Select Run-time Settings > General: Log, and check Enable logging, Always send messages, Extended log, Data returned by server, Advanced trace.
Compare the record and replay snapshots for each step in the script from the beginning, and locate the first difference. If you identify a difference in the snapshots, locate the corresponding HTTP request in both the recording log and the extended log. Compare the requests and, if they are different, have the replay issue exactly the same request. This can be done, for example, by adding web_add_header (for adding missing headers or adjusting existing ones), web_remove_auto_header (for removing extra headers), and web_add_cookie (for missing cookies).
If some correlation is missing, (e.g., the recording and replay runs have different session IDs), use the correlation tool to locate and handle such cases.
