RStudio server error: "Unable to connect to service" in CentOs 8

[pacoceam]

Hi everyone

We have bought a new CentOS Linux release 8.4.2105 machine with preinstalled RStudio Server. Although it seems to properly run (

root :> systemctl status rstudio-server.service
● rstudio-server.service - RStudio Server
Loaded: loaded (/etc/systemd/system/rstudio-server.service; enabled; vendor preset: disabled)
Active: active (running) since Wed 2021-06-09 14:05:34 CEST; 3 weeks 5 days ago
Main PID: 2666 (rserver)
Tasks: 3 (limit: 3355442)
Memory: 49.6M
CGroup: /system.slice/rstudio-server.service
└─2666 /usr/lib/rstudio-server/bin/rserver

when trying to log from the web browser we get an error message

"Could not connect to the R session on RStudio Server. Unable to connect to service (1)"

Is it a permission problem? Everything under /usr/lib/rstudio-server is owned by root

What should we check? There is no any log file under /var/log/rstudio-server

Thanks in advance

[shivak3]

Hi Pacoceam,

Please check the rstudio server configure file under

/etc/rstudio/rserver.conf 

provide the port number, ip address and point rsession using the below link. And also Don't forget to check the SELinux and Firewall status.

Configuring RStudio Workbench / RStudio Server

[pacoceam]

Hi Shiva

rserver.conf and rsession.conf files in /etc/rstudio are empty. When connecting to RStudio Server we try LOCALIP:8787

# getenforce
Enforcing
# sestatus
SELinux status:                 enabled
SELinuxfs mount:                /sys/fs/selinux
SELinux root directory:         /etc/selinux
Loaded policy name:             targeted
Current mode:                   enforcing
Mode from config file:          enforcing
Policy MLS status:              enabled
Policy deny_unknown status:     allowed
Memory protection checking:     actual (secure)
Max kernel policy version:      32

sudo systemctl status firewalld

● firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2021-06-09 18:03:40 CEST; 3 weeks 6 days ago
Docs: man:firewalld(1)
Main PID: 43124 (firewalld)
Tasks: 3 (limit: 3355442)
Memory: 34.3M
CGroup: /system.slice/firewalld.service
└─43124 /usr/libexec/platform-python -s /usr/sbin/firewalld --nofork --nopid

jun 09 18:03:39 tabarca2 systemd[1]: Starting firewalld - dynamic firewall daemon...
jun 09 18:03:40 tabarca2 systemd[1]: Started firewalld - dynamic firewall daemon.
jun 09 18:03:40 tabarca2 firewalld[43124]: WARNING: AllowZoneDrifting is enabled. This is considered an insecure configu>
jun 09 18:04:27 tabarca2 firewalld[43124]: WARNING: AllowZoneDrifting is enabled. This is considered an insecure configu>
jun 09 18:04:29 tabarca2 firewalld[43124]: WARNING: AllowZoneDrifting is enabled. This is considered an insecure configu>
jun 10 14:02:30 tabarca2 firewalld[43124]: WARNING: AllowZoneDrifting is enabled. This is considered an insecure configu>
jun 10 14:04:36 tabarca2 firewalld[43124]: WARNING: AllowZoneDrifting is enabled. This is considered an insecure configu>
jun 10 14:06:18 tabarca2 firewalld[43124]: WARNING: AllowZoneDrifting is enabled. This is considered an insecure

[pacoceam]

Following your indications I've read something on selinux and tried to set it to "permissive" with

setenforce 0

and now everything is working fine.

[shivak3]

Hi Pacoceam,

Great. Good to know you can able to run Rstudio-server.

Also, please remember that "setenforce 0" will switch off SELinux temporarily until the Linux box is rebooted. Please plan for it. -Thank you.