document gvfsd debugging

_toc.yml

@@ -117,6 +117,7 @@ chapters:
           - file: admin-guide/troubleshooting/selinux
           - file: admin-guide/troubleshooting/boot
           - file: admin-guide/troubleshooting/kerberos
+          - file: admin-guide/troubleshooting/gvfs
           - file: admin-guide/troubleshooting/sssd
           - file: admin-guide/troubleshooting/pam
           - file: admin-guide/troubleshooting/pcie_bus_error

admin-guide/troubleshooting/kerberos.md

@@ -1,13 +1,13 @@
-# Kerberos
+# GVFS (Gnome Virtual Filesystem)
 
-PSI Kerberos documentation: https://intranet.psi.ch/de/knowledge-base/kerberos-and-afs
+GVFS or `gio mount` allows access to different types of network filesystems like SMB/CIFS and protocols like FTP or SFTP.
 
- - Old AIT AD Kerberos troubleshooting guide: [PDF](../_static/AIT-AD-Kerberos-Troubleshooting.pdf)
- - Old AIT keytab file documentation: [PDF](../_static/AIT-Keytab-File.pdf)
-
-
-Enable trace log of the Kerberos library to troubleshoot authentication problems (e.g. for curl):
+If Nautilus access to such a destination or a `gio mount ...` does not work, following can be used to see what happens inside `gvfsd`:
 
 ```bash
-KRB5_TRACE=/dev/stderr curl -v --negotiate -u : https://boot00-test.psi.ch/sysdb/v1/node > /dev/null
+GVFS_SMB_DEBUG=10 GVFS_DEBUG=1 $(find /usr/lib* -name gvfsd 2>/dev/null) --replace
+```
+of if Kerberos is involved and might be the issue:
+```bash
+KRB5_TRACE=/dev/stdout GVFS_SMB_DEBUG=10 GVFS_DEBUG=1 $(find /usr/lib* -name gvfsd 2>/dev/null) --replace
 ```