远程调试msvsmon.exe VS2015或无法附加到进程时表达式计算器中的内部错误。 rpc服务器不可用

Question

System in written in C# , .Net4.5 . I am trying to remote debug one of our Web APIs. I am using msvsmon.exe (2015) on server and running Visual Studio 2015 on my local.

I can connect to process no problem and breakpoints are being hit, I am also sure I am running same version of code as I manually copied over dll and pdb files from my local machine to the server.

I can't even inspect strings when they are fired into endpoint I get Internal error in the expression evaluator . To remedy this error offered solution is to tick the box on Managed Compatibility Mode in Tools -> Options -> Debugging however, when I do this, when I try to attach to process in debug window, I get unable to attach to the process. the rpc server is unavailable unable to attach to the process. the rpc server is unavailable . Solution to which offered is to untick that same box , lol.

I have also tried in vain to enable Use the legacy C# and VB expression evaluators in debug options but that didn't do any good.

I am sure someone by now have ran into this problem.... How do I inspect objects when remote debugging on VS2015?

Answer 1

I met the error "unable to attach to the process. the rpc server is unavailable" before which was related to the firewall, like Hans Passant's suggestion, you could test it again after you close/disable the firewall or other third party tools. Of course, you could also add your VS Devenv.exe to the Firewall allow list like this thread, debug it again.

https://cerkit.com/2014/08/12/remote-debugging-issue-with-asp-net-unable-to-attach-to-the-process/