I think your syntax on the call is not right...
I tend to use the export command for tabcmd instead, and I assume you have already run a login command. If not, you can add them to your request as below:
tabcmd export "RealEstate/MortgagePaymentsCalculator?Interest%20Rate=.05&Loan%20Term=40" --png -f "TestingGET.png" --timeout 500 -s xxServerxx -u username -p p@ssw0rd
Thanks for the reply Nathan. I tried the export command and I still get the default values and not the values I set.
Thanks for the tip on the login command. I was running the login command first and didn't realize it could be added into the request like that. My knowledge is really limited here.
I imagine since it comes up fine in a web browser, there must be a way to get this done--maybe with some tool other than tabcmd.
Finally found my issue solved in another thread. I was needing a second "%" within the quotes when using %20 for a space. I've got a lot to learn.
In batch files, the percent sign may be "escaped" by using a double percent sign ( %% ).
That way, a single percent sign will be used as literal within the command line, instead of being further interpreted.