title: unable to start rstudio in centos getting error "unable to connect to service"
body: <p>I have Rstudio server installed on CentOS 6, but I cannot login to Rstudio from the browser at <a href="http://localhost:8787" rel="nofollow">http://localhost:8787</a> in browser. A popup titled "RStudio Initialization Error" appears with message "Unable to connect to service".</p>
  
  <p>I have tried the following to remedy the error, but I have been without success:</p>
  
  <pre><code>$ sudo rstudio-server verify-installation
  rstudio-server stop/waiting
  rserver[19273]: ERROR system error 13 (Permission denied) [username=rstudio-server]; OCCURRED AT: core::Error server::launchSession(const std::string&amp;, const core::system::Options&amp;, PidType*) /root/rstudio/src/cpp/server/ServerSessionManager.cpp:223; LOGGED FROM: int main(int, char* const*) /root/rstudio/src/cpp/server/ServerMain.cpp:428
  rstudio-server start/running, process 19287
  
  $ id -u supstat1
  502 (user name is more than 500)
  
  $ sudo usermod -g rstudio_users supstat1
  
  $ sudo vi /etc/sysconfig/iptables as root
  and added the following line(s)
  Add -A INPUT -m state --state NEW -m tcp -p tcp --dport 8787 -j ACCEPT
  Add -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
  
  $ sudo lsof | grep rstudio
  rserver   9597 rstudio-server  cwd       DIR                8,1      4096          2 /
  rserver   9597 rstudio-server  rtd       DIR                8,1      4096          2 /
  rserver   9597 rstudio-server  txt       REG                8,1   7990044     553699 /usr/lib/rstudio-server/bin/rserver
  rserver   9597 rstudio-server  mem       REG                8,1    156928     391944 /lib64/ld-2.12.so
  rserver   9597 rstudio-server  mem       REG                8,1   1926800     391948 /lib64/libc-2.12.so
  rserver   9597 rstudio-server  mem       REG                8,1    599384     396110 /lib64/libm-2.12.so
  rserver   9597 rstudio-server  mem       REG                8,1     22536     391993 /lib64/libdl-2.12.so
  rserver   9597 rstudio-server  mem       REG                8,1    145896     391952 /lib64/libpthread-2.12.so
  rserver   9597 rstudio-server  mem       REG                8,1     91096     391950 /lib64/libz.so.1.2.3
  rserver   9597 rstudio-server  mem       REG                8,1   1410824     564111 /usr/lib64/libcrypto.so.0.9.8e
  rserver   9597 rstudio-server  mem       REG                8,1    327488     567429 /usr/lib64/libssl.so.0.9.8e
  rserver   9597 rstudio-server  mem       REG                8,1    124624     396127 /lib64/libselinux.so.1
  rserver   9597 rstudio-server  mem       REG                8,1    113952     406171 /lib64/libresolv-2.12.so
  rserver   9597 rstudio-server  mem       REG                8,1     18936     396128 /lib64/libuuid.so.1.3.0
  rserver   9597 rstudio-server  mem       REG                8,1     93320     396113 /lib64/libgcc_s-4.4.7-20120601.so.1
  rserver   9597 rstudio-server  mem       REG                8,1     17256     392157 /lib64/libcom_err.so.2.1
  rserver   9597 rstudio-server  mem       REG                8,1    177520     392161 /lib64/libk5crypto.so.3.1
  rserver   9597 rstudio-server  mem       REG                8,1     12592     406310 /lib64/libkeyutils.so.1.3
  rserver   9597 rstudio-server  mem       REG                8,1    280520     392159 /lib64/libgssapi_krb5.so.2.2
  rserver   9597 rstudio-server  mem       REG                8,1    944712     391997 /lib64/libkrb5.so.3.3
  rserver   9597 rstudio-server  mem       REG                8,1    989840     536152 /usr/lib64/libstdc++.so.6.0.13
  rserver   9597 rstudio-server  mem       REG                8,1     46368     406311 /lib64/libkrb5support.so.0.1
  rserver   9597 rstudio-server  mem       REG                8,1     17520     406322 /lib64/libutil-2.12.so
  rserver   9597 rstudio-server  mem       REG                8,1     65928     391959 /lib64/libnss_files-2.12.so
  rserver   9597 rstudio-server    0u      CHR                1,3       0t0       3643 /dev/null
  rserver   9597 rstudio-server    1u      CHR                1,3       0t0       3643 /dev/null
  rserver   9597 rstudio-server    2u      CHR                1,3       0t0       3643 /dev/null
  rserver   9597 rstudio-server    3r     FIFO                0,8       0t0      37905 pipe
  rserver   9597 rstudio-server    4w     FIFO                0,8       0t0      37905 pipe
  rserver   9597 rstudio-server    5u      REG                0,9         0       3641 anon_inode
  rserver   9597 rstudio-server    6u     IPv4              37907       0t0        TCP *:msgsrvr (LISTEN)
  </code></pre>