# Connected to Grin server, but thread 'client\_controller' panicked

**URL:** <https://forum.grin.mw/t/connected-to-grin-server-but-thread-client-controller-panicked/860>\
**Category:** Mining\
**Created:** [September 23, 2018, 5:00pm UTC](https://forum.grin.mw/t/connected-to-grin-server-but-thread-client-controller-panicked/860 "2018-09-23T17:00:39Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![givanse](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.grin.mw/givanse/32/483_2.png) [@givanse](https://forum.grin.mw/u/givanse)\
**Post date:** [September 23, 2018, 5:00pm UTC](https://forum.grin.mw/t/connected-to-grin-server-but-thread-client-controller-panicked/860/1 "2018-09-23T17:00:39Z")

</div>

ran `netstat -tulpn` and saw

```auto
tcp 0 0 127.0.0.1:13413 0.0.0.0:* LISTEN 5022/./grin/target/ 
tcp 0 0 0.0.0.0:13414 0.0.0.0:* LISTEN 5022/./grin/target/ 

```

so I started grin-miner, it seemed to have connected fine

> Connected to Grin server at 127.0.0.1:13413

But it doesn’t mine. I looked at the log and it had:

```auto
Sep 23 09:43:28.633 INFO This is Grin-Miner version 0.3.0 (git 38e00f5), built for x86_64-unknown-linux-gnu by rustc 1.29.0 (aa3ca1994 2018-09-11).
Sep 23 09:43:28.633 DEBG Built with profile "debug", features "" on Fri, 21 Sep 2018 18:40:42 GMT.
Sep 23 09:43:29.633 WARN Connection Status: Connected to Grin server at 127.0.0.1:13413.
Sep 23 09:43:29.733 DEBG sending request: {"id":"0","jsonrpc":"2.0","method":"getjobtemplate","params":null}
Sep 23 09:43:30.033 DEBG Received message: HTTP/1.1 400 Bad Request

Sep 23 09:43:30.172 ERRO 
thread 'client_controller' panicked at 'called `Result::unwrap()` on an `Err` value: Error("expected value", line: 1, column: 1)': libcore/result.rs:945stack backtrace:
   0: 0x56105ef0ad05 - backtrace::backtrace::libunwind::trace::ha7c99bed1f1ee6b7
                        at /home/sealion/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.9/src/backtrace/libunwind.rs:53
                         - backtrace::backtrace::trace::h02e4d0e7b04d6bb0
                        at /home/sealion/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.9/src/backtrace/mod.rs:42
   1: 0x56105ef069be - backtrace::capture::Backtrace::new_unresolved::hb1f712c00acbb897
                        at /home/sealion/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.9/src/capture.rs:88
   2: 0x56105ef0691c - backtrace::capture::Backtrace::new::hf58aa3ccf61b4dae
                        at /home/sealion/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.9/src/capture.rs:63
   3: 0x56105eabc857 - grin_miner_util::logger::send_panic_to_log::{{closure}}::he3855b7829d844b5
                        at util/src/logger.rs:120
   4: 0x56105ef32d33 - std::panicking::rust_panic_with_hook::hba05450791beb933
                        at libstd/panicking.rs:479
   5: 0x56105ef328d9 - std::panicking::continue_panic_fmt::hd2a4220d2e2291e2
                        at libstd/panicking.rs:390
   6: 0x56105ef327d5 - rust_begin_unwind
                        at libstd/panicking.rs:325
   7: 0x56105ef887db - core::panicking::panic_fmt::h2c383e888dce42c0
                        at libcore/panicking.rs:77
   8: 0x56105eb01e8a - core::result::unwrap_failed::he8468de21a764cff
                        at /checkout/src/libcore/macros.rs:26
   9: 0x56105e8595b1 - <core::result::Result<T, E>>::unwrap::hd4376c865a9956e5
                        at /checkout/src/libcore/result.rs:782
  10: 0x56105e8795ef - grin_miner::client::Controller::run::h81bc6f0cd844f6a9
                        at src/bin/client.rs:427
  11: 0x56105e89f488 - grin_miner::main::{{closure}}::h2aa23056af06107a
                        at src/bin/grin_miner.rs:171

```