# Ttn-lw-migrate error

**URL:** <https://www.thethingsnetwork.org/forum/t/ttn-lw-migrate-error/51194>\
**Category:** Migrating Devices to V3\
**Created:** [September 1, 2021, 8:56am UTC](https://www.thethingsnetwork.org/forum/t/ttn-lw-migrate-error/51194 "2021-09-01T08:56:29Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![IdeaIoT](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/ideaiot/32/35697_2.png) [@IdeaIoT](https://www.thethingsnetwork.org/forum/u/IdeaIoT)\
**Post date:** [September 1, 2021, 8:56am UTC](https://www.thethingsnetwork.org/forum/t/ttn-lw-migrate-error/51194/1 "2021-09-01T08:56:30Z")

</div>

Hello,  
Today it is impossible for me to migrate a sensor via the migration tool ttn-lw-migrate.

It shows me a connection error. (see screenshot)  
Is it working with you or is the problem with me?

![Screenshot_1](https://www.thethingsnetwork.org/forum/uploads/default/original/3X/8/a/8ab367e43b998b7ae7ae8ca05d4b3ded3ae8b70c.png)

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<div class="post-metadata">

**Author:** ![descartes](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/descartes/32/47220_2.png) [@descartes](https://www.thethingsnetwork.org/forum/u/descartes)\
**Post date:** [September 1, 2021, 9:17am UTC](https://www.thethingsnetwork.org/forum/t/ttn-lw-migrate-error/51194/2 "2021-09-01T09:17:48Z")

</div>

Bit hard to tell if it’s you or something else as the picture isn’t readable - perhaps you could repost the log as text, not forgetting to format it with the \</\> tool.

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<div class="post-metadata">

**Author:** ![IdeaIoT](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/ideaiot/32/35697_2.png) [@IdeaIoT](https://www.thethingsnetwork.org/forum/u/IdeaIoT)\
**Post date:** [September 1, 2021, 9:23am UTC](https://www.thethingsnetwork.org/forum/t/ttn-lw-migrate-error/51194/3 "2021-09-01T09:23:37Z")

</div>

Sorry for picture.

Log :

```
C:\Users\adm\Downloads\lorawan-stack-migrate_0.6.0_windows_386>ttn-lw-migrate devices --dry-run --verbose --source ttnv2 "iotidea032" > devices.json
 DEBUG [core]parsed scheme: ""
 DEBUG [core]scheme "" not registered, fallback to default scheme
 DEBUG [core]ccResolverWrapper: sending update to cc: {[{discovery.thethings.network:1900 <nil> 0 <nil>}] <nil> <nil>}
 DEBUG [core]ClientConn switching balancer to "pick_first"
 DEBUG [core]Channel switches to new LB policy "pick_first"
 DEBUG [core]Subchannel Connectivity change to CONNECTING
 DEBUG [core]Subchannel picks a new address "discovery.thethings.network:1900" to connect
 DEBUG [core]pickfirstBalancer: UpdateSubConnState: 0x1309e1e0, {CONNECTING <nil>}
 DEBUG [core]Channel Connectivity change to CONNECTING
  WARN [core]grpc: addrConn.createTransport failed to connect to {discovery.thethings.network:1900 discovery.thethings.network:1900 <nil> 0 <nil>}. Err: connection error: desc = "transport: Error while dialing dial tcp 52.178.215.58:1900: i/o timeout". Reconnecting...
 DEBUG [core]Subchannel Connectivity change to TRANSIENT_FAILURE
 DEBUG [core]pickfirstBalancer: UpdateSubConnState: 0x1309e1e0, {TRANSIENT_FAILURE connection error: desc = "transport: Error while dialing dial tcp 52.178.215.58:1900: i/o timeout"}
 DEBUG [core]Channel Connectivity change to TRANSIENT_FAILURE
 DEBUG [core]Subchannel Connectivity change to CONNECTING
 DEBUG [core]Subchannel picks a new address "discovery.thethings.network:1900" to connect
 DEBUG [core]pickfirstBalancer: UpdateSubConnState: 0x1309e1e0, {CONNECTING <nil>}
 DEBUG [core]Channel Connectivity change to CONNECTING
  WARN [core]grpc: addrConn.createTransport failed to connect to {discovery.thethings.network:1900 discovery.thethings.network:1900 <nil> 0 <nil>}. Err: connection error: desc = "transport: Error while dialing dial tcp 52.178.215.58:1900: i/o timeout". Reconnecting...
 DEBUG [core]Subchannel Connectivity change to TRANSIENT_FAILURE
 DEBUG [core]pickfirstBalancer: UpdateSubConnState: 0x1309e1e0, {TRANSIENT_FAILURE connection error: desc = "transport: Error while dialing dial tcp 52.178.215.58:1900: i/o timeout"}
 DEBUG [core]Channel Connectivity change to TRANSIENT_FAILURE
 DEBUG [core]Subchannel Connectivity change to CONNECTING
 DEBUG [core]Subchannel picks a new address "discovery.thethings.network:1900" to connect
 DEBUG [core]pickfirstBalancer: UpdateSubConnState: 0x1309e1e0, {CONNECTING <nil>}
 DEBUG [core]Channel Connectivity change to CONNECTING
  WARN [core]grpc: addrConn.createTransport failed to connect to {discovery.thethings.network:1900 discovery.thethings.network:1900 <nil> 0 <nil>}. Err: connection error: desc = "transport: Error while dialing dial tcp 52.178.215.58:1900: i/o timeout". Reconnecting...
 DEBUG [core]Subchannel Connectivity change to TRANSIENT_FAILURE
 DEBUG [core]pickfirstBalancer: UpdateSubConnState: 0x1309e1e0, {TRANSIENT_FAILURE connection error: desc = "transport: Error while dialing dial tcp 52.178.215.58:1900: i/o timeout"}
 DEBUG [core]Channel Connectivity change to TRANSIENT_FAILURE
 DEBUG [core]Subchannel Connectivity change to CONNECTING
 DEBUG [core]Subchannel picks a new address "discovery.thethings.network:1900" to connect
 DEBUG [core]pickfirstBalancer: UpdateSubConnState: 0x1309e1e0, {CONNECTING <nil>}
 DEBUG [core]Channel Connectivity change to CONNECTING
  WARN [core]grpc: addrConn.createTransport failed to connect to {discovery.thethings.network:1900 discovery.thethings.network:1900 <nil> 0 <nil>}. Err: connection error: desc = "transport: Error while dialing dial tcp 52.178.215.58:1900: i/o timeout". Reconnecting...
 DEBUG [core]Subchannel Connectivity change to TRANSIENT_FAILURE
 DEBUG [core]pickfirstBalancer: UpdateSubConnState: 0x1309e1e0, {TRANSIENT_FAILURE connection error: desc = "transport: Error while dialing dial tcp 52.178.215.58:1900: i/o timeout"}
 DEBUG [core]Channel Connectivity change to TRANSIENT_FAILURE
 DEBUG [core]Subchannel Connectivity change to CONNECTING
 DEBUG [core]Subchannel picks a new address "discovery.thethings.network:1900" to connect
 DEBUG [core]pickfirstBalancer: UpdateSubConnState: 0x1309e1e0, {CONNECTING <nil>}
 DEBUG [core]Channel Connectivity change to CONNECTING
  WARN [core]grpc: addrConn.createTransport failed to connect to {discovery.thethings.network:1900 discovery.thethings.network:1900 <nil> 0 <nil>}. Err: connection error: desc = "transport: Error while dialing dial tcp 52.178.215.58:1900: i/o timeout". Reconnecting...
 DEBUG [core]Subchannel Connectivity change to TRANSIENT_FAILURE
 DEBUG [core]pickfirstBalancer: UpdateSubConnState: 0x1309e1e0, {TRANSIENT_FAILURE connection error: desc = "transport: Error while dialing dial tcp 52.178.215.58:1900: i/o timeout"}
 DEBUG [core]Channel Connectivity change to TRANSIENT_FAILURE
 DEBUG [core]Subchannel Connectivity change to CONNECTING
 DEBUG [core]Subchannel picks a new address "discovery.thethings.network:1900" to connect
 DEBUG [core]pickfirstBalancer: UpdateSubConnState: 0x1309e1e0, {CONNECTING <nil>}
 DEBUG [core]Channel Connectivity change to CONNECTING
  WARN [core]grpc: addrConn.createTransport failed to connect to {discovery.thethings.network:1900 discovery.thethings.network:1900 <nil> 0 <nil>}. Err: connection error: desc = "transport: Error while dialing dial tcp 52.178.215.58:1900: i/o timeout". Reconnecting...
 DEBUG [core]Subchannel Connectivity change to TRANSIENT_FAILURE
 DEBUG [core]pickfirstBalancer: UpdateSubConnState: 0x1309e1e0, {TRANSIENT_FAILURE connection error: desc = "transport: Error while dialing dial tcp 52.178.215.58:1900: i/o timeout"}
 DEBUG [core]Channel Connectivity change to TRANSIENT_FAILURE
 DEBUG [core]Subchannel Connectivity change to CONNECTING
 DEBUG [core]Subchannel picks a new address "discovery.thethings.network:1900" to connect
 DEBUG [core]pickfirstBalancer: UpdateSubConnState: 0x1309e1e0, {CONNECTING <nil>}
 DEBUG [core]Channel Connectivity change to CONNECTING
```

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<div class="post-metadata">

**Author:** ![descartes](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/descartes/32/47220_2.png) [@descartes](https://www.thethingsnetwork.org/forum/u/descartes)\
**Post date:** [September 1, 2021, 9:54am UTC](https://www.thethingsnetwork.org/forum/t/ttn-lw-migrate-error/51194/4 "2021-09-01T09:54:26Z")

</div>

What ISP are you on?

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<div class="post-metadata">

**Author:** ![IdeaIoT](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/ideaiot/32/35697_2.png) [@IdeaIoT](https://www.thethingsnetwork.org/forum/u/IdeaIoT)\
**Post date:** [September 1, 2021, 1:12pm UTC](https://www.thethingsnetwork.org/forum/t/ttn-lw-migrate-error/51194/5 "2021-09-01T13:12:34Z")

</div>

Thanks, it’s coming from my internet connection. It’s probably my company’s firewall blocking it.  
I switched to LTE and no more problems.

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<div class="post-metadata">

**Author:** ![system](https://www.thethingsnetwork.org/forum/uploads/default/original/3X/6/2/6250ea44fd2b0d6259489e1a92748df681e1f970.png) [@system](https://www.thethingsnetwork.org/forum/u/system)\
**Post date:** [September 2, 2021, 1:13pm UTC](https://www.thethingsnetwork.org/forum/t/ttn-lw-migrate-error/51194/6 "2021-09-02T13:13:15Z")

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