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By using the below command, we can remote login to machine even though a session is already opened.

mstsc /v:{server name} /admin


Sometimes there might be a requirement to keep some files in the LG machine for temporary use. Have the file included in the script which needs to be copied to LG machine. Use the below mentioned commands to create a temporary folder inside c:\temp folder and copy the file from script folder to newly created folder in LG machine. Once the use of file is completed, use the last command to delete the newly created folder. Char command1[]=”mkdir \”c:\\temp\\\ext_jar”;

Char command2[]=”xcopy /Y filename.pdf \”c:\\temp\\\ext_jar\””;

Char command3[]=”RD /S /Q \”c:\\temp\\\ext_jar\””;





Issue: “communication between vugen and the truclient browser could not be established”. This error occurs when we click the ‘Develop Script’ button.

Solution: Simple step, Run the Vugen.exe as ‘Administrator’.

IP Spoofing in Loadrunner

IP Spoofing

It is a technique used for creating Internet Protocol (IP) packets with a forged source IP address, with the purpose of hiding the identity of the sender address.

IP Spoofing in Loadrunner

This technique is used in Loadrunner Agent machines, in order to make the Application server to think requests are coming from different machines. This purposely used in the Load Balancing Application servers which runs on the IP based distribution.

Procedures to configure the IP Spoofing in Loadrunner

Step 01: Get the required number of static IPs (based on number of vusers to be executed) from the Network Administrator, which should have the same ‘Default gateway’ of the LG machine.

Step 02: Follow the IP wizard in the LG machine and do the setup by adding the required number of Static IPs.

Step 03: After finishing the configuration setup, try pinging one of the static IP. It should not get ‘Timed Out’ error.

Step 04: Now we are ready to do the execution with Controller. While creating the scenario, enable the ‘IP Spoofing’ option in the LG machine.

This should work. If any issues, comment to reach me. Thanks.

Inorder to start scripting the SAP applications using the Loadrunner tool, we have to enable the scripting mode available in the SAP application apart from the normal script enabling setting.

Please use the TCode – RZ11

Navigate to the page it allows and change the settings to ‘FALSE’ for the below mentioned parameters.

a. sapgui/user_scripting_set_readonly and set the value as “FALSE”
b. sapgui/user_scripting_force_notification and set the value as “FALSE”


In Loadrunner script, we use block size per vuser for using the huge range of unique values in a parameter. But during the test, if the execution failes inbetween its very hard to re-allocate the block size again by checking the unused values. In-order to solve this issue, we can use the LR_ADVANCE_PARAM function in loadrunner. Please find below the usage format to implement this.

int x,y,v,i;  // declare these variables as integer
v=atoi(lr_eval_string(“{VuserID}”));  // get the VuserID and store it in v
i=atoi(lr_eval_string(“{ItNum}”));  // get the Iteration number and store it in i
 x=v;  // For the first iteration, x = VuserID
 x=6;  // For the second iterations onward, x = No of Vusers  + 1 (assuming Vusers = 5)
lr_advance_param(“CreatedCustID”);  // parameter file name (keep settings as Sequential Once)



return 0;

Machine A : PC which you are using to active remote desktop connection in another PC

Machine B : PC for which remote desktop connection has to be activated.


 Step 1:

From Machine A :  Goto Start -> Run -> regedit. Open the Registry window of Machine A.

(Note: User ID logged in Machine A should have ADMIN rights in Machine B)

Step 2:

Click “Connect Network Registry“

Step 3:

Enter the computer name of Machine B, for which we have to change the settings and Click “OK”


The destination machine (Machine B) will be connected with our current logged in machine (Machine A).


Step 5:

Goto the below mentioned path and change the fDenyTSConnections to “0” and click “OK”.

 HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services

 Step 6:

After doing the following changes, right-click the remote machine (Machine B) name and click Disconnect.

(NOTE: If suppose the above mentioned registry value is not found, then create a DWORD parameter with a value ‘0’.

The purpose of a firewall is to increase security by blocking communications and allowing communications with only certain ports, such as 80 and 443 for HTTP and HTTPS traffic.
By default, the LoadRunner Controller uses TCP port 50500 to send data to TCP port 54345 on the Windows Load Generator.
The Load Generator sends information back via a dynamic port, through the MI Listener.
To avoid having to beg Network Administrators for more ports to be opened, on each load generator machine inside the firewall, from

Start > Programs > LoadRunner > Advanced Settings > Agent Configuration (launch_service\bin\AgentConfig.exe)

install the (Monitoring Over Firewall machine) MoFW/RoWF agent.

Check the option “Enable Firewall Agent”.  It collects performance counters and sends them to a controller over a firewall. MoFW communicates with the MI Listener through port 443, so you can’t have any web servers (like Apache WebTours, IIS, or Oracle HTTP servers) running on both the machines.
Verify whether port 443 actually allows communication by running command and substituting the ip address in:
telnet 443
This should open a telnet window.

UNIX Load Generator uses a dynamic port that cannot be fixed.
When defining a “remote” load generator from within the Controller, click “Details” for the “Load Generator Information” dialog, where you can click the “Firewall” tab and check “Enable Firewall”.
Courtesy :

Note: checkboxvalueRaw is the list of correlated values which is being listed in the check boxes. It has to be checked in random numberr and submitted.

int i, j;

char checkboxvalue_param[100],temp_param[60], temp1_param[60];




          lr_output_message (“i is %d, j is %d”, i,j);


                   {        sprintf (checkboxvalueRaw_param, “{checkboxvalueRaw_%d}”, i);

                             lr_save_string(lr_eval_string(checkboxvalueRaw_param), “checkboxvalue_sel”);

                             strcpy(temp_param, temp1_param);

                             strcat(temp_param, lr_eval_string(“{checkboxvalue_sel}”));

                             if (i<j)


                                      strcat(temp_param, “,”);


                             strcpy(temp1_param, temp_param);



                   while (i==j);

lr_save_string(lr_eval_string(temp_param), “checkboxvalue_sel”);

char newvalue[15]=”I Love India”;

long pfile;

char *filename = “C:\\Sample.txt”;

pfile = fopen( filename,”a+” );

if(pfile == NULL)


printf( “Error in opening the filename – %s “,filename );


fputs(newvalue,pfile );

fputs( “\n”,pfile );

fclose( pfile );