# Error 502 bad gateway

**URL:** <https://forum.pydio.com/t/error-502-bad-gateway/3412>\
**Category:** Pydio Cells\
**Created:** [August 6, 2020, 7:48am UTC](https://forum.pydio.com/t/error-502-bad-gateway/3412 "2020-08-06T07:48:22Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![nasanbuyan](https://avatars.discourse-cdn.com/v4/letter/n/5fc32e/32.png) [@nasanbuyan](https://forum.pydio.com/u/nasanbuyan)\
**Post date:** [August 6, 2020, 7:48am UTC](https://forum.pydio.com/t/error-502-bad-gateway/3412/1 "2020-08-06T07:48:22Z")

</div>

Hi guys,

I have a problem with cells login page. Please see the below error log. I guess it is trying to connect dns.

[ERROR 502 /a/frontend/session] dial tcp: lookup PENDING on x.x.x.x:53: server misbehaving  
 ![cells](https://canada1.discourse-cdn.com/flex032/uploads/pydio/original/2X/8/8f6187970e152c5f96420b2c91e3f61359979250.jpeg)

---

<div class="post-metadata">

**Author:** ![bsinou](https://yyz2.discourse-cdn.com/flex032/user_avatar/forum.pydio.com/bsinou/32/476_2.png) [@bsinou](https://forum.pydio.com/u/bsinou)\
**Post date:** [August 6, 2020, 7:54am UTC](https://forum.pydio.com/t/error-502-bad-gateway/3412/2 "2020-08-06T07:54:03Z")

</div>

Hello @nasanbuyan and welcome to the forum.

could you please give some details about your setup and show the server logs when you start the server and try to login ?

That would give precious information to anyone willing to help you !

Thanks

---

<div class="post-metadata">

**Author:** ![nasanbuyan](https://avatars.discourse-cdn.com/v4/letter/n/5fc32e/32.png) [@nasanbuyan](https://forum.pydio.com/u/nasanbuyan)\
**Post date:** [August 12, 2020, 8:18am UTC](https://forum.pydio.com/t/error-502-bad-gateway/3412/3 "2020-08-12T08:18:30Z")

</div>

I am sorry for late reply.

when i login into cells then i got below error.

![cells](https://canada1.discourse-cdn.com/flex032/uploads/pydio/original/2X/5/51bd492823ad232161357e8c099a113da97df7ef.png)

Please see ./cells start log

[root@fss pydio]# WARNING: File descriptor limit 1024 is too low for running Pydio Cells Home Edition in production. At least 8192 is recommended. Fix with “ulimit -n 8192”.  
2020-08-12T16:14:31.957+0800 INFO pydio.grpc.log started  
2020-08-12T16:14:31.958+0800 INFO pydio.gateway.rest started  
2020-08-12T16:14:31.960+0800 INFO pydio.grpc.docstore started  
2020-08-12T16:14:32.168+0800 INFO pydio.web.statics started  
2020-08-12T16:14:32.169+0800 INFO pydio.grpc.healthcheck started  
2020-08-12T16:14:32.239+0800 INFO pydio.grpc.update started  
2020-08-12T16:14:32.241+0800 INFO pydio.grpc.data.objects started  
2020-08-12T16:14:32.241+0800 INFO pydio.grpc.data.objects Starting umbrella service pydio.grpc.data.objects. with sources {“sources”: [“local1”]}  
2020-08-12T16:14:32.380+0800 INFO pydio.grpc.data.sync started  
2020-08-12T16:14:32.380+0800 INFO pydio.grpc.data.sync Starting umbrella service pydio.grpc.data.sync. with sources {“sources”: [“pydiods1”, “personal”, “cellsdata”]}  
2020-08-12T16:14:34.348+0800 INFO pydio.grpc.acl started  
2020-08-12T16:14:34.349+0800 INFO pydio.grpc.config started  
2020-08-12T16:14:34.758+0800 INFO pydio.grpc.user-key started  
INFO[0005] No tracer configured - skipping tracing setup  
2020-08-12T16:14:35.219+0800 INFO pydio.grpc.meta started  
2020-08-12T16:14:35.249+0800 INFO pydio.grpc.chat started  
2020-08-12T16:14:35.283+0800 INFO pydio.grpc.policy started  
2020-08-12T16:14:35.403+0800 INFO pydio.grpc.user-meta started  
2020-08-12T16:14:35.519+0800 INFO pydio.grpc.oauth started  
Activating privacy features… done.  
2020-08-12T16:14:35.937+0800 INFO pydio.gateway.proxy Runner generator returned ServiceStartNeedsRetry error, waiting for 10s  
2020-08-12T16:14:36.026+0800 INFO pydio.web.oauth started  
2020-08-12T16:14:36.063+0800 INFO pydio.grpc.workspace started  
2020-08-12T16:14:36.178+0800 INFO pydio.grpc.data-key started  
2020-08-12T16:14:36.251+0800 INFO pydio.grpc.role started  
2020-08-12T16:14:36.387+0800 INFO pydio.grpc.tree started  
2020-08-12T16:14:36.570+0800 INFO pydio.gateway.websocket started  
2020-08-12T16:14:36.623+0800 INFO pydio.grpc.jobs started  
2020-08-12T16:14:36.922+0800 INFO pydio.grpc.data.objects.local1 started  
2020-08-12T16:14:37.079+0800 INFO pydio.grpc.data.sync.pydiods1 started  
2020-08-12T16:14:37.260+0800 INFO pydio.grpc.data.sync.personal started  
2020-08-12T16:14:37.416+0800 INFO pydio.grpc.data.sync.cellsdata started  
2020-08-12T16:14:37.596+0800 INFO pydio.grpc.data.objects.local1 Starting local objects service local1 on /root/.config/pydio/cells/data  
2020-08-12T16:14:37.787+0800 INFO pydio.grpc.data.sync.pydiods1 Sync pydiods1 - Try to contact Objects  
2020-08-12T16:14:37.964+0800 INFO pydio.grpc.data.index started  
2020-08-12T16:14:37.965+0800 INFO pydio.grpc.data.index Starting umbrella service pydio.grpc.data.index. with sources {“sources”: [“pydiods1”, “personal”, “cellsdata”]}  
2020-08-12T16:14:37.984+0800 INFO pydio.grpc.data.sync.personal Sync personal - Try to contact Objects  
2020-08-12T16:14:38.217+0800 INFO pydio.grpc.data.sync.cellsdata Sync cellsdata - Try to contact Objects  
2020-08-12T16:14:38.280+0800 INFO pydio.grpc.tasks started  
2020-08-12T16:14:38.381+0800 ERROR pydio.grpc.tasks Streamer PutTaskStream {“error”: “{“id”:“go.micro.client”,“code”:500,“detail”:“none available”,“status”:“Internal Server Error”}”}  
2020-08-12T16:14:38.919+0800 INFO pydio.grpc.mailer Starting mailer with queue ‘boltdb’  
2020-08-12T16:14:39.044+0800 INFO pydio.grpc.activity started  
2020-08-12T16:14:39.598+0800 INFO pydio.grpc.user started  
2020-08-12T16:14:39.740+0800 INFO pydio.grpc.mailer Starting mailer with sender ‘smtp’  
2020-08-12T16:14:39.741+0800 INFO pydio.grpc.mailer started  
2020-08-12T16:14:41.054+0800 INFO pydio.grpc.versions started  
2020-08-12T16:14:41.055+0800 INFO pydio.test.objects started  
2020-08-12T16:14:42.163+0800 INFO pydio.grpc.data.sync.pydiods1 Sync pydiods1 - Try to contact Objects  
2020-08-12T16:14:42.220+0800 INFO pydio.grpc.data.sync.personal Sync personal - Try to contact Objects  
2020-08-12T16:14:42.428+0800 INFO pydio.grpc.data.sync.cellsdata Sync cellsdata - Try to contact Objects  
2020-08-12T16:14:43.192+0800 INFO pydio.grpc.timer started  
2020-08-12T16:14:44.849+0800 INFO pydio.grpc.data.index.cellsdata started  
2020-08-12T16:14:46.100+0800 INFO pydio.gateway.data started  
2020-08-12T16:14:45.344+0800 INFO pydio.grpc.data.index.personal started  
2020-08-12T16:14:45.343+0800 INFO pydio.grpc.data.index.pydiods1 started  
2020-08-12T16:14:46.157+0800 INFO pydio.grpc.data.sync.pydiods1 Sync pydiods1 - Try to contact Objects  
2020-08-12T16:14:46.212+0800 INFO pydio.grpc.data.sync.personal Sync personal - Try to contact Objects  
2020-08-12T16:14:46.419+0800 INFO pydio.grpc.data.sync.cellsdata Sync cellsdata - Try to contact Objects  
2020-08-12T16:14:48.552+0800 INFO pydio.grpc.search started  
2020-08-12T16:14:49.219+0800 INFO pydio.rest.log started  
2020-08-12T16:14:49.276+0800 INFO pydio.rest.config started  
2020-08-12T16:14:49.551+0800 INFO pydio.gateway.wopi started  
2020-08-12T16:14:49.697+0800 INFO pydio.rest.workspace started  
2020-08-12T16:14:49.798+0800 INFO pydio.rest.acl started  
2020-08-12T16:14:50.056+0800 INFO pydio.gateway.dav started  
2020-08-12T16:14:50.064+0800 INFO pydio.rest.mailer started  
2020-08-12T16:14:50.105+0800 INFO pydio.rest.policy started  
2020-08-12T16:14:50.128+0800 INFO pydio.rest.role started  
2020-08-12T16:14:50.190+0800 INFO pydio.rest.frontend started  
2020-08-12T16:14:50.213+0800 INFO pydio.rest.user started  
2020-08-12T16:14:50.300+0800 INFO pydio.rest.jobs started  
2020-08-12T16:14:50.313+0800 INFO pydio.rest.user-meta started  
2020-08-12T16:14:50.323+0800 INFO pydio.rest.update started  
2020-08-12T16:14:50.153+0800 INFO pydio.grpc.data.sync.pydiods1 Sync pydiods1 - Try to contact Objects  
2020-08-12T16:14:50.160+0800 INFO pydio.grpc.data.sync.pydiods1 Successfully listed objects from bucket pydiods1  
2020-08-12T16:14:50.397+0800 INFO pydio.rest.templates started  
2020-08-12T16:14:50.221+0800 INFO pydio.grpc.data.sync.personal Sync personal - Try to contact Objects  
2020-08-12T16:14:50.230+0800 INFO pydio.grpc.data.sync.personal Successfully listed objects from bucket personal  
2020-08-12T16:14:50.485+0800 INFO pydio.rest.graph started  
2020-08-12T16:14:50.510+0800 INFO pydio.rest.auth started  
2020-08-12T16:14:50.545+0800 INFO pydio.rest.activity started  
2020-08-12T16:14:50.429+0800 INFO pydio.grpc.data.sync.cellsdata Sync cellsdata - Try to contact Objects  
2020-08-12T16:14:50.436+0800 INFO pydio.grpc.data.sync.cellsdata Successfully listed objects from bucket cellsdata  
2020-08-12T16:14:50.600+0800 INFO pydio.rest.meta started  
2020-08-12T16:14:50.607+0800 INFO pydio.rest.tree started  
2020-08-12T16:14:50.644+0800 INFO pydio.rest.share started  
2020-08-12T16:14:50.751+0800 INFO pydio.rest.search started  
Activating privacy features… done.  
2020-08-12T16:14:55.537+0800 INFO pydio.grpc.tasks Run Job resync-ds-pydiods1 on timer event   
2020-08-12T16:14:55.613+0800 INFO pydio.grpc.tasks Run Job resync-ds-personal on timer event   
2020-08-12T16:14:55.675+0800 INFO pydio.grpc.data.sync.pydiods1 Got Stats for index://pydiods1 {“stats”: {“HasChildrenInfo”:false,“HasSizeInfo”:false,“Size”:0,“Children”:0,“Folders”:0,“Files”:0}}  
2020-08-12T16:14:55.677+0800 INFO pydio.grpc.data.sync.pydiods1 Got Stats for s3://10.36.66.32:40863/pydiods1 {“stats”: {“HasChildrenInfo”:false,“HasSizeInfo”:false,“Size”:0,“Children”:0,“Folders”:0,“Files”:0}}  
2020-08-12T16:14:55.678+0800 INFO pydio.grpc.data.sync.pydiods1 Listing all S3 objects for path {“bucket”: “pydiods1”, “path”: “”}  
2020-08-12T16:14:55.682+0800 INFO pydio.grpc.data.sync.pydiods1 S3 Walk Operation + Stats took {“d”: “4.512ms”}  
2020-08-12T16:14:55.682+0800 INFO pydio.grpc.data.sync.pydiods1 Diff Stats {“s”: {“EndpointLeft”:“s3://10.36.66.32:40863/pydiods1”,“EndpointRight”:“index://pydiods1”,“conflicts”:0,“missingLeft”:0,“missingRight”:0}}  
2020-08-12T16:14:55.682+0800 INFO pydio.grpc.data.sync.pydiods1 Finished analyzing nodes {“i”: 4}  
2020-08-12T16:14:55.683+0800 INFO pydio.grpc.data.sync.pydiods1 Sending unidirectional patch {“patch”: {“Source”:“s3://10.36.66.32:40863/pydiods1”,“Target”:“index://pydiods1”,“Type”:“TreePatch”}}  
2020-08-12T16:14:55.683+0800 INFO pydio.grpc.data.sync.pydiods1 Filtering TreePatch took {“time”: “7.9µs”, “source”: “s3://10.36.66.32:40863/pydiods1”, “target”: “index://pydiods1”}  
2020-08-12T16:14:55.683+0800 INFO pydio.grpc.data.sync.pydiods1 Empty Patch : nothing to do  
2020-08-12T16:14:55.837+0800 INFO pydio.grpc.tasks Run Job resync-ds-cellsdata on timer event   
2020-08-12T16:14:55.828+0800 INFO pydio.grpc.data.sync.personal Got Stats for index://personal {“stats”: {“HasChildrenInfo”:false,“HasSizeInfo”:false,“Size”:0,“Children”:0,“Folders”:0,“Files”:0}}  
2020-08-12T16:14:55.829+0800 INFO pydio.grpc.data.sync.personal Got Stats for s3://10.36.66.32:40863/personal {“stats”: {“HasChildrenInfo”:false,“HasSizeInfo”:false,“Size”:0,“Children”:0,“Folders”:0,“Files”:0}}  
2020-08-12T16:14:55.830+0800 INFO pydio.grpc.data.sync.personal Listing all S3 objects for path {“bucket”: “personal”, “path”: “”}  
2020-08-12T16:14:55.833+0800 INFO pydio.grpc.data.sync.personal S3 Walk Operation + Stats took {“d”: “3.5406ms”}  
2020-08-12T16:14:55.833+0800 INFO pydio.grpc.data.sync.personal Diff Stats {“s”: {“EndpointLeft”:“s3://10.36.66.32:40863/personal”,“EndpointRight”:“index://personal”,“conflicts”:0,“missingLeft”:0,“missingRight”:0}}  
2020-08-12T16:14:55.833+0800 INFO pydio.grpc.data.sync.personal Finished analyzing nodes {“i”: 4}  
2020-08-12T16:14:55.834+0800 INFO pydio.grpc.data.sync.personal Sending unidirectional patch {“patch”: {“Source”:“s3://10.36.66.32:40863/personal”,“Target”:“index://personal”,“Type”:“TreePatch”}}  
2020-08-12T16:14:55.834+0800 INFO pydio.grpc.data.sync.personal Filtering TreePatch took {“time”: “7.4µs”, “source”: “s3://10.36.66.32:40863/personal”, “target”: “index://personal”}  
2020-08-12T16:14:55.834+0800 INFO pydio.grpc.data.sync.personal Empty Patch : nothing to do  
2020-08-12T16:14:55.965+0800 INFO pydio.grpc.data.sync.cellsdata Got Stats for index://cellsdata {“stats”: {“HasChildrenInfo”:false,“HasSizeInfo”:false,“Size”:0,“Children”:0,“Folders”:0,“Files”:0}}  
2020-08-12T16:14:55.966+0800 INFO pydio.grpc.data.sync.cellsdata Got Stats for s3://10.36.66.32:40863/cellsdata {“stats”: {“HasChildrenInfo”:false,“HasSizeInfo”:false,“Size”:0,“Children”:0,“Folders”:0,“Files”:0}}  
2020-08-12T16:14:55.966+0800 INFO pydio.grpc.data.sync.cellsdata Listing all S3 objects for path {“bucket”: “cellsdata”, “path”: “”}  
2020-08-12T16:14:55.970+0800 INFO pydio.grpc.data.sync.cellsdata S3 Walk Operation + Stats took {“d”: “3.8962ms”}  
2020-08-12T16:14:55.970+0800 INFO pydio.grpc.data.sync.cellsdata Diff Stats {“s”: {“EndpointLeft”:“s3://10.36.66.32:40863/cellsdata”,“EndpointRight”:“index://cellsdata”,“conflicts”:0,“missingLeft”:0,“missingRight”:0}}  
2020-08-12T16:14:55.970+0800 INFO pydio.grpc.data.sync.cellsdata Finished analyzing nodes {“i”: 4}  
2020-08-12T16:14:55.971+0800 INFO pydio.grpc.data.sync.cellsdata Sending unidirectional patch {“patch”: {“Source”:“s3://10.36.66.32:40863/cellsdata”,“Target”:“index://cellsdata”,“Type”:“TreePatch”}}  
2020-08-12T16:14:55.971+0800 INFO pydio.grpc.data.sync.cellsdata Filtering TreePatch took {“time”: “7.3µs”, “source”: “s3://10.36.66.32:40863/cellsdata”, “target”: “index://cellsdata”}  
2020-08-12T16:14:55.971+0800 INFO pydio.grpc.data.sync.cellsdata Empty Patch : nothing to do

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<div class="post-metadata">

**Author:** ![nasanbuyan](https://avatars.discourse-cdn.com/v4/letter/n/5fc32e/32.png) [@nasanbuyan](https://forum.pydio.com/u/nasanbuyan)\
**Post date:** [August 12, 2020, 8:21am UTC](https://forum.pydio.com/t/error-502-bad-gateway/3412/4 "2020-08-12T08:21:31Z")

</div>

Please see caddy\_errors.log

Why does cells need to establish with local dns.

12/Aug/2020:16:07:14 +0800 [ERROR 502 /a/frontend/session] dial tcp: lookup PENDING on x.x.x.x:53: server misbehaving  
12/Aug/2020:16:09:10 +0800 [ERROR 502 /a/frontend/session] dial tcp: lookup PENDING on x.x.x.x:53: server misbehaving  
12/Aug/2020:16:09:10 +0800 [ERROR 502 /a/frontend/session] dial tcp: lookup PENDING on x.x.x.x:53: server misbehaving  
12/Aug/2020:16:09:10 +0800 [ERROR 502 /a/frontend/session] dial tcp: lookup PENDING on x.x.x.x:53: server misbehaving  
12/Aug/2020:16:15:31 +0800 [ERROR 502 /a/frontend/session] dial tcp: lookup PENDING on x.x.x.x:53: server misbehaving

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<div class="post-metadata">

**Author:** ![Alexlv4](https://yyz2.discourse-cdn.com/flex032/user_avatar/forum.pydio.com/alexlv4/32/1211_2.png) [@Alexlv4](https://forum.pydio.com/u/Alexlv4)\
**Post date:** [September 23, 2020, 11:08pm UTC](https://forum.pydio.com/t/error-502-bad-gateway/3412/5 "2020-09-23T23:08:26Z")

</div>

Hi same error here

dial tcp: lookup PENDING on 8.8.8.8:53: no such host

I can access to pydio, but I cant upload or download files.

The error appears when I update it.

SOLUTION:  
Hi,

If anyone has this error, my fix was grant permission to cells folder  
setcap ‘cap\_net\_bind\_service=+ep’ cells

Thanks