Prometheus not connecting to alertmanager

[Power2All]

I got this problem that prometheus isn't connecting to alertmanager.
Network looks to be fine, but it's not able to connect to the IP address given in the logs.

level=info ts=2019-03-26T10:57:47.979177541Z caller=main.go:244 msg="Starting Prometheus" version="(version=2.5.0, branch=HEAD, revision=67dc912ac8b24f94a1fc478f352d25179c94ab9b)",
level=info ts=2019-03-26T10:57:47.982924182Z caller=main.go:245 build_context="(go=go1.11.1, user=root@578ab108d0b9, date=20181106-11:40:44)",
level=info ts=2019-03-26T10:57:47.982956117Z caller=main.go:246 host_details="(Linux 4.15.18-11-pve #1 SMP PVE 4.15.18-34 (Mon, 25 Feb 2019 14:51:06 +0100) x86_64 227ce4d1d192 (none))",
level=info ts=2019-03-26T10:57:47.983021401Z caller=main.go:247 fd_limits="(soft=1048576, hard=1048576)",
level=info ts=2019-03-26T10:57:47.983047421Z caller=main.go:248 vm_limits="(soft=unlimited, hard=unlimited)",
level=info ts=2019-03-26T10:57:47.983826146Z caller=main.go:562 msg="Starting TSDB ...",
level=info ts=2019-03-26T10:57:47.988462388Z caller=web.go:399 component=web msg="Start listening for connections" address=0.0.0.0:9090,
level=info ts=2019-03-26T10:57:48.003159108Z caller=main.go:572 msg="TSDB started",
level=info ts=2019-03-26T10:57:48.003214832Z caller=main.go:632 msg="Loading configuration file" filename=/etc/prometheus/prometheus.yml,
level=info ts=2019-03-26T10:57:48.01808873Z caller=main.go:658 msg="Completed loading of configuration file" filename=/etc/prometheus/prometheus.yml,
level=info ts=2019-03-26T10:57:48.018152796Z caller=main.go:531 msg="Server is ready to receive web requests.",
level=error ts=2019-03-26T10:57:56.045698965Z caller=notifier.go:473 component=notifier alertmanager=http://alertmanager:9093/api/v1/alerts count=0 msg="Error sending alert" err="Post http://alertmanager:9093/api/v1/alerts: dial tcp 10.0.6.7:9093: connect: no route to host",
level=error ts=2019-03-26T10:59:06.157660555Z caller=notifier.go:473 component=notifier alertmanager=http://alertmanager:9093/api/v1/alerts count=1 msg="Error sending alert" err="Post http://alertmanager:9093/api/v1/alerts: dial tcp 10.0.6.7:9093: connect: no route to host",

Alertmanager runs fine:

[Power2All]

Nobody seem to be able to figure out this problem ?

[xkfen]

same problem, any help?

[mashun4ek]

having the same issue :(

[aduzsardi]

seems like you containers are not in the same network, just attach your alermanager container to the same network as your prometheus and it should work