Account: User Profile / Limitations of Profile Storage Space on Computers in Pool Rooms

The user profile contains the user registry, i.e. all personal configurations for the appearance of Windows and for particular applications.

The Outlook address book and Internet Explorer's favourites are being stored in the user profile on the computer's hard disk and also being copied to the server at log-off, as well as some files that are generated by particular applications.
Please make sure never to save your files (for example Word documents, images etc) within the profile storage space. Always save them in your home directory on the U: drive.

The size of the user profile on computers in pool rooms and within the RDS is limited to 30 MB, i.e. it must not become larger than 30 MB.

Information about the current size can be gathered by clicking on this symbol in the lower right of the Windows task bar:

The following window will appear:

If the allowed 30 MB of profile storage space are exceeded then the following error message will appear and you will not be able to log off (as long as you do not want to log off you can ignore this message. You do not have to interrupt your work because of it):

The symbol in the lower right of the Windows task bar has changed:

You must double-click on this symbol. After that the windows depicted in the following screenshot will appear. There you will see the size of the files stored in your user profile. Below „Größeninformation“ you will be shown the current and the maximum profile storage space. It would make sense to delete the biggest space hogs there unless you absolutely need them.

Should the list contain a noticeably high amount of files belonging to Mozilla, this probably means that your browser cache is being stored within the profile. In that case you will find instructions to change this a bit further down on this page.

In all other cases you will have to delete the files manually. To do this, open Windows Explorer and change to the directory "C:\Users\[yourusername]" (for Windows 7 it is -"C:\Dokumente und Einstellungen"). There you will find your user profile bearing your user name. Click on it, then press both STRG (CTRL) and F simultaneously. A window will open in which you may search for files. Doing this you will find out which directory contains the big files that inflate your user profile and cause this error message. You should then delete those files. All temporary files are especially convenient for deletion, i.e. files with a name beginning with ~ or with a name ending on .tmp. Just never delete files called NTUSER.DAT or ntuser.dat.LOG. If you have deleted enough files, then the small red symbol in the lower right of the Windows task bar will vanish. The window showing the files may then be closed by clicking on OK. If during logout you still get that error message, please contact → our hotline.

Hint: Within the explorer menu below 'Extras - Ordneroptionen - Ansicht' you should set up the folder that stores your profile so that it displays all files - including hidden ones. This way you will make sure that you can always see all files in your profile:

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Home Directory: On Which Server Is It?

If you do not know on which one of the two servers fs01 or fs02 your home is located, you can obtain this information in the following way:

Follow this link to the → self-administration web pages for your JGU Account. Enter your JGU Account name and its password.

Within the left-hand navigation, click on Benutzerkonto (in the English user interface it is called User account).

Listed beside  'Heimverzeichnis/Home directory' you will find the information about the server name, formatted like this: \fs01\youraccoutname$ ​or \fs02\youraccoutname$.

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Home Directory: Your Personal Storage Space

Please note: Some of the links below lead to pages in German, as work on the English version is still in progress. We apologize for the inconvenience.

Students have 15 Gigabyte, members of staff 75 Gigabyte of storage space at their disposal within the so-called home directory - which is your personal storage space at the university. This directory can be accessed from computers within the university as well as from your home or your private notebook - as explained in the following instructions. Also, the data stored in your home directory are automatically and regularly backed up. If you change or delete a file accidentally, then it can easily be restored via the → snapshot function.

If you log in at a computer on campus - for example: within the pool rooms of the Data Center - with your JGU account, then you personal home directory will automatically be listed under 'Computer'/'Dieser PC' (in ealier Windows versions: 'Arbeitsplatz') as a drive. The drive is named with you accout name and will usually be listed under the drive letter U:
The same applies if you log in via remote desktop.
If the home directory is not automatically listed as a drive you may add it manually. The same applies if you are not working from a PC at the university of Mainz, but are connected to the internet via an external provider. In that case you must first log in to the → Virtual Private Network (VPN) of the university before you can connect the personal home directory as a drive. Log in to VPN with your user name and the corresponding password. Alternatively (and this is a bit simpler), you may use a connection via WebDAV (please see below).
Open the file explorer (Windows key + E) and select "This PC" in the left navigation. Then click on Connect network drive in the toolbar at the top.

In the following dialogue window, first select any free drive letter.


Enter the following as the folder

\\\username$ or


(depending on which of the two servers fs01 and fs02 your home directory is located on).

→ Here you can find out which server it is for you.

Replace 'username' with your user name.

If your computer is not included in the Windows domain '', e.g. a private PC at home or in the Wlan, please click on Establish connection with other log-in information. A small window will now open in which you enter your (Attention: Even if you are a student, there is no 'students' in your name in this case). The password is the password of your JGU account. Close the window with OK.

If you want your home drive to be automatically reconnected the next time you log on, please tick the box next to "Reconnect on logon".

Now click on Finish. You will now find your home directory under the letter selected above under "Computer".

By using the Webdav protocol you may very easily access the files in your home directory via an internet connection. Instructions on how to do this for various operating systems and devices may be found on our → information pages about Webdav.
Access to your own home directory may also be established via FTP according to

→ the following documentation. With the following change: the path for the FTP server (within FileZilla this is the field 'Standardordner auf dem Server') has to remain empty. If nothing is entered here, you will automatically be connected to your own home directory after login.

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Account: Adding or Changing Your User Image

Every owner of a JGU account of the university of Mainz may add a picture of him/herself to his account data. This picture will then be shown, for example, below any mail that you send via Microsoft Outlook.



Upload Your User Image

To upload your image, please log in at → using your JGU account login. Then click on User account.


On the right of the next screen, click on Edit picture.

Now you may upload an image. Depending on the size of the uploaded image, this process may take a couple of minutes. We recommend an image size of 200x200 pixels, because that size is sufficient.

Please also note that you may only upload jpg-images, since other file formats are not supported..

Finally click on Save and then the image will be added to your JGU account data.

Changing Your User Image

In order to change your user image, please login at the URL mentioned above. Click on User account and then on Edit picture. Now you may either delete your current picture or simply upload a new picture. If you upload and save a new image file, the old image file is replaced.

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Account: Change of Password

You can change the password of your JGU account at the user account self management site. The change will be made via an encrypted connection to the server at the Data Center. Alternatively the change may be made at computer terminals in the Data Center.

→ Change or reset password

Password conditions and restrictions:

For the login, the password must basically meet the following conditions:

  • The new password should contain at least 12 characters and three of the following four categories:
    • Capital letters (A..Z)
    • Lowercase letters (a..z)
    • Numbers (0..9)
    • Special characters (! "$% & / () =? + * # -.,;: _)
  • Your password must not contain your last name, first name, user name (account name) or any part thereof.
  • Do not use any of your previous passwords.
  • Avoid:
    • §, ä, ö, ü, ß, Ä, Ö, Ü, because these characters are not available on all keyboards*.
    • y, Y, z or Z, as these characters are in different places on English and German keyboards. This can cause problems if the computer unexpectedly loads an English / German keyboard layout.
* Note: If possible, do not use any third-party or public computers to log in with your university password.

Additional security check for new passwords and password changes

Since January 2021, an additional security check has been carried out with the database for each new password and each password change. This collects the hashes of the passwords* from password databases that are circulating on the Internet and checks whether the selected password was published in the event of a previous data leak. If so, you will be notified:
  • JGU account page: You will receive a message that the password you entered was part of a data breach and must not be used.
  • When changing the password under Windows using the key combination CTRL + Alt + Del or In such a case, Ctrl + Alt + Del "Change password" appears that the password does not meet the complexity rules. A more specific message cannot be displayed as the ZDV has no way of adapting it.
To ensure that the hashes of the passwords* are not passed on to a third party or website, the entire database was copied directly from the provider and has been running on ZDV's own server since then.
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Application for a JGU account

Please note: Some of the links below lead to pages in German, as work on the English version is still in progress. We apologize for the inconvenience.

Accounts are automatically set up for members of staff of the university.
Students have to → activate their JGU account once after their first enrollment.

For all other use cases, Information about application or prolongation of a JGU account may be obtained here:


In case you as a visiting scientist, project staff member or student assistant have not been handed a JGU account yet, you may ask for the person in charge of accounts at the deanery of your faculty or at the secretariat of your institution.

If you would like to prolongate your JGU account please either contact the person in charge of accounts within your institution yourself, or ask your supervisor to do it.

...may turn to the check-out counter of the central library to apply for a suitable account.

The university library account for external users only serves for printing within the university library and has no further privileges, i.e. you cannot use it for mailing, login at the Data Center, using terminal servers, VPN, WLAN etc.

Members of staff of the university hospital receive their JGU account from the person in charge of accounts of their particular clinic. Please contact the administration of the clinic, the person in charge of its IT or your supervisor.

Institutions that have not yet notified us about a person in charge of accounts may do so by sending an e-mail to → .

At this time we are sorry to say that we cannot hand out any new accounts to members of staff of a training hospital of the university of Mainz. If you have any enquiries about that, please ask the → department of legal matters of the university.
Accounts for members of staff of all external institutions are administrated by the institution itself - please turn to the secretariat or the person in charge of IT at the institution that you are a member of. If need be, you may ask at → which procedure applies at your institution. You will get access, but these accounts do not include an own, personal homepage.

Specialties for Databases

If you need access to Unix-based data or a database that is being administrated by another organisational unit, an application for access also requires the approval of the people listed below. An application has to include the exact rights of access (reading/writing).

It is enough if the person listed signs a print-out of your application form. Without such an approval it is not possible to grant access to these data.

Contacts for Database Questions

Administration of traffic (KFZ): Rainer Even

Administration of students (SOS/ZUL): Herr Einig

The Service Regulation

Please file this → service regulation. (It is the base for dissuasions in case this regulation is violated, for example if passwords are imparted).

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Account Activation for Students after First Enrollment

After your first enrollment at the university of Mainz you have to activate your JGU account once. To do this you need:

Step 1: After your enrollment, you will receive an individual link and an activation code via email to your private email address.
Step 2: During the JGU account activation, you define your personal password. Information on secure passwords can be found here:

Step 3: You will get the login name of your JGU account.

Did you forget your password?

  • If you still have a PUK from the old procedure, you can still use it to reset your password for the time being via
  • If you have forgotten your password and do not have a PUK, you can request a PUK during opening hours at the Central Library Circulation Desk. Be sure to bring your certificate of enrollment (or matriculation number) and your official photo ID (ID card or passport) with you. The new PUKwill be given to you there immediately.

You are not able to pick up your replacement PUK in person at the Central Library?

  • In this case, please contact the ZDV hotline. To do so, send an e-mail with the subject "Student account: Lost Password" and the following data to
    • First and last name, matriculation number, date of birth, account name (if known).
    • Whether the JGU account has already been activated or used.
    • Postal address (the ZDV can only send the PUK if the address given matches the address stored in the Student Secretariat).
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Please note: Some of the links below lead to pages in German, as work on the English version is still in progress. We apologize for the inconvenience.

Possession of a JGU account is a prerequisite for using most of the services of the Data Center. User name and password together form the components of identification for your JGU account. All members of staff of the university automatically have an active JGU account.



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