RMI Client UnmarshalException with UNC paths

I have a 'none' Java application, that has an embedded JVM which is being used as an RMI server to allow communication to the application from a browser. The applet detects the presence of the RMI server and if not detected, will start the application, which in turns starts the RMI server. Once the RMI server is started the Client then invokes the method on the server, and hence into the application.
If the executable for this application is pathed to either a local or mapped drive then everything works as expected, if I then try to use a UNC path, once the RMI server is started, the client returns an UnmarshalException:
java.rmi.UnmarshalException: Error unmarshaling return header; nested exception is:
java.io.EOFException
java.io.EOFException
at java.io.DataInputStream.readByte(Unknown Source)
at sun.rmi.transport.StreamRemoteCall.executeCall(Unknown Source)
at sun.rmi.server.UnicastRef.invoke(Unknown Source)
at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
at java.rmi.Naming.lookup(Unknown Source)
I guess that the problem is that the serialization process has been started, and as the client starts reading from the datastream the UNC paths cause the EOF Exception. any help on how to get round this problem would be gratefully received. Unfortunately using a mapped drive is not a solution to this problem due to the way the application is being served.

Hi all,
It turns out that when the java.policy file is being read, it ignores the servername on the UNC path and therefore looks for a directory of the remaining data of the UNC path for the file. I guess it is now a task of figuring out why this is...

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Replace Mapped Drives with UNC Paths via Group Policy Preferences

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Thanks,
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> We are currently using Group Policy Preferences to map network drives to
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SAP DB13 BRARCHIVE with UNC path causes an Error

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Using UNC Path With Execute Process Task

I have an Execute Process task in which the process can either delete, get or put files to an SFTP site. The executeable takes arguments in the following format:
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It could be that the executable does not support UNC paths, and I'm checking that. I have another package that uses this same application, but uses the physical path, and there are no problems. Does the Execute Process task have issues with UNC paths?
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Actually it doesn't work properly in SQL Server 2008 R2. I have a similar EP task. If I set the working directory to \\server\share\subdir the task fails. However, if I map a drive latter to the \\server\share and set working directory to <drive>:\subdir
it works

UNC paths and java.io.file in Oracle

Hi,
I'm just getting to grips with using some basic java in the database. I'm using 8.1.7 on W2K.
I'm trying to test for the existance of a file on a separate w2k domain:
import java.io.File;
public class JFileExists {
public static int fileexists (String fileName) {
File myFile = new File (fileName);
boolean retval = myFile.exists();
if (retval) return 1; else return 0;
public static void main (String args[]) {
System.out.println (
fileexists (args[0])
grant javasyspriv to mp;
function jfn_file_exists (file_in IN VARCHAR2) RETURN number
AS LANGUAGE JAVA NAME 'JFileExists.fileexists (java.lang.String) return int';
From the command prompt all is well:
E:\java>"c:\oracle\ora81\Apache\jdk\bin\java.exe" JFileExists i:\test.txt
1
E:\java>"c:\oracle\ora81\Apache\jdk\bin\java.exe" JFileExists \\mpweb1\image\test.txt
1
But when loaded into oracle its returning false with the UNC path. (but is ok with a mapped drive to the same path)
SQL> declare
2 begin
3 pa_main.pr_print(to_char(pa_main.jfn_file_exists('I:\test.txt')));
4 pa_main.pr_print(to_char(pa_main.jfn_file_exists('\\mpweb1\image\test.txt')));
5 end;
6 /
1
0
PL/SQL procedure successfully completed.
The oracleservicesid and listener are starting under a user called oracle_user which is a member
of the admins and domain admins group.
mpweb1 is on a separate domain to the database server mpdb1 but it also has a user called oracle_user with the same password.
oracle_user has full access to the share in question.
Am I missing something? I was trying to keep the database server and web server on different domains for better security
- but would things be easier if they were on the same domain?
Any help much appreciated for this java newbi!
Thanks,
Simon.
null

I am also having problems with UNC paths. But I cannot access the location even if it is mapped as a drive. In JDK VJM I do not have a problem, but in Oracle it says the file cannot be found and say permission denied. I will try to change the user that starts the database and see if that helps.
null

Flash Player 14 onwards - UNC Path not working

Dear all,
Up until and including Flash Player 13, I have been able to refer to a .SWF file using the UNC path of the file (\\Server\Folder\File.swf).
Since I have installed both Flash Player 14 and 15, I have been unable to refer to the file using the UNC path, but instead having to Map Network Drive of the Server and Folder (X:\File.swf).
Can someone tell me why I can no longer use the UNC path? Or is there a setting I need to check?
Kind regards,
Chris

Hi Vincent.
Thanks for responding to my post. I can confirm that I was running Version 15.0.0.152, which didn't work with UNC paths. I have now tried the beta Version 15.0.0.159, which fixes the issue.
What can I take from this? Well the good news is that this is resolved in future versions.
The bad news is that my user base can have any version installed on their machines. Some users are on Version 13, some on Version 14 and some on Version 15. The issue is that some of these users have opted for the "Never check for updates" option after Flash has installed, meaning that they are happy to remain on their chosen version. Having a user base of at least 500, it's impossible for one self to update all machines to the beta version. At the same time, users will now have to wait an unspecified period of time for the next version and if they have installed Version 14 or 15 with the selected option "Never check for updates", then I am permanently going to struggle with using UNC paths.
This episode has the potential to cause serious issues for myself as a developer and also for my company. My respect for the Adobe Flash product has dropped big time.
If there are any other suggestions, then I am all ears.
Regards,
Chris

FileExists and UNC path

I've noticed a strange behaviour of FileExists(const char path[], ssize_t **fileSize) function with UNC paths (\\<hostname>\<sharename>[\<objectname>]*):
if <hostname> is an alias of a non-existent host, FileExists returns 0 (File not found) - for example FileExists("\\\\server-name\\folder-name\\file.txt", NULL)
if <hostname> is an unreachable IP address, FileExists return -93 (UIEIOError) - for example FileExists("\\\\192.168.1.1\\folder-name\\file.txt", NULL)
This happens also if you try with the path to the same file, written with the host IP address and its corresponding alias, when the host becomes unreachable.
Tested with CVI 2009 SP1
Is this an expected behaviour?
Vix
In claris non fit interpretatio
Using LV 2013 SP1 on Win 7 64bit
Using LV 8.2.1 on WinXP SP3
Using CVI 2012 SP1 on Win 7 64bit, WinXP and WinXP Embedded
Using CVI 6.0 on Win2k, WinXP and WinXP Embedded

Hello Vix,
I've tried with either CVI 2009 Version 9.1.1 (450) and CVI 2009 Version 9.1.0 (428) and I always get 0 if the alias is bad or the IP is unreachable.
Here's the code I've run:
int ret=0;
ret=FileExists ("\\\\it-mil-wds01\\AEs\\pippo.txt", NULL);
printf("Il valore e' %d",ret);
getchar();
int ret=0;
ret=FileExists ("\\\\server\\AEs\\pippo.txt", NULL);
printf("Il valore e' %d",ret);
getchar();
Can you give me your exact version of CVI?
Thanks,
Andrea
Andrea N.
Systems Engineer ATE & RF - Mediterranean Region
National Instruments Italy

Windows, File Adapter, UNC path

Hi <experts>
Does somebody have experience with UNC paths in a file adapter?
According to SAP note 821267 Q38 it should be no problem in a Windows environment.
I'm in a pure Windows environment, and want my receiver file adapter to write files to server XXX which has a share called YYY.
I have entered
XXX\YYY in my target directory field but com. channel keeps saying that the directory does not exist.
I have created user SAPService<SID> on server XXX with full rights.
Are there any other prerequisites .... anything I've overlooked ?
Help highly appreciated (with points)

Vitor,
You speak about Samba and mount. Isn't that only relevant in an AIX/UNIX environment ?
My environment is 100% Windows. All hosts are running Windows.
Hans

Unable to access UNC path on 2012 R2 file server with ABE enabled

Brief Description:
We have granted access to people via a domain local group on a folder on a file server that is three levels deep from the share, i.e. \\servercluster\share\folder1\folder2\folder3, where folder3 is where the group is granted Read & Execute
access. The share has Access-Based Enumeration (ABE) enabled and the Everyone group has Full Control share permissions. We also use DFS, so the path for that is \\domain\dfsrootname\folderfororganization\share\folder1\folder2\folder3. People
in the aforementioned group only have access to folder3, its subfolders, and files. They do not have any access to folder2 or any of the other folders higher in the tree at all. Also, consider that folder3 contains a subfolder folder4, which is
simply inheriting permissions.
What we have found is that clients running Windows 7 SP1 have strange access issues when attempting to access the folder via either the DFS or cluster name UNC paths.
Detailed Testing Results Accessing Folder3 Directly:
NOTE: "UNC path" in the following test results means either the DFS or the cluster name share path. The results are the same regardless which path is used.
1 - Enter UNC path without trailing backslash in Windows Explorer's address bar:
Windows Explorer seems to do nothing for about 30 seconds and then displays the following error:
"Windows cannot access <UNC path>
Check the spelling of the name. Otherwise, there might be a problem with your network. To try to identify and resolve network problems, click Diagnose."
2 - Enter UNC path with trailing backslash in Windows Explorer's address bar:
The same error encountered in #1 is displayed immediately.
3 - Enter UNC path with or without trailing backslash but contained in double quotes in Windows Explorer's address bar:
Internet Explorer opens and displays the error:
"Internet Explorer cannot display the webpage"
4 - Enter UNC path without trailing backslash in Run dialog box:
An error message immediately appears:
"<UNC path>
The specified path does not exist.
Check the path and then try again."
5 - Enter UNC path with trailing backslash in Run dialog box:
Same as #4.
6 - Enter UNC path without trailing backslash but contained in double quotes in Run dialog box:
Same as #4.
7 - Enter UNC path with trailing backslash and contained in double quotes in Run dialog box:
Windows Explorer opens the correct UNC path location and displays the folder contents. This is the expected behavior for all of these attempts.
8 - Create Shortcut to UNC path by performing #7 and then dragging the folder icon in Windows Explorer's address bar to either to the desktop or the Favorites section, and then attempt to access the folder via
the shortcut.
Same as #7.
9 - Attempt to create a shortcut to the UNC path using the New Shortcut wizard:
Unable to successfully create the shortcut, regardless if you add a backslash at the end or enclose the path in double qutoes. When you press Next after entering the UNC path, you receive the following error:
"The file <UNC path> cannot be found."
10 - Disable ABE on the share and repeat all tests:
All tests with ABE disabled on the share have the same result as #7. There is no issue whatsoever accessing the desired folder when ABE is disabled.
Other Notable Behaviors:
If the aforementioned folder (folder3) contains one or more subfolders (e.g. folder4), you are able to access those subfolders via UNC path directly and then go up one level to folder3 without issue, even when ABE is enabled. You just cannot access
folder3 directly via UNC path unless you attempt to access it via the method used in #7 above or a successfully created shortcut.
Adding a user account directly to the folder3 ACL rather than using group membership makes no difference.
If access is granted to folder4 instead of folder3 (the fourth folder deep rather than the third), accessing folder4 directly via UNC path is not an issue regardless of ABE status or attempted access method.
Windows 8 and 8.1 clients have no trouble directly accessing the folder's UNC path via any method. The unusual, undesirable behavior seen in Windows 7 is non-existent on Windows 8.x clients.
Systems Involved:
Client: Windows 7 Enterprise SP1 x86
Server: Windows Server 2012 R2 Standard in cluster
Other Details About the Systems:
Both the client and the file server cluster are in the domain AD DS domain.
The client and the file server cluster are in different subnets.
There is no firewall or other packet inspection or compression service/device in between the client and server (not even Windows Firewall).
Question:
Is there a way to fix this behavior with Windows 7 clients and ABE enabled on the share so that it works correctly without forcing the clients or server to use SMBv1 or disabling ABE on the shares?

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It should be noted that I can't repeat the behavior on my test machine again today after some changes were made in our environment.
Today, I found that someone had modified permissions on the folder to give the group my test account was a member of rights to traverse the folder hierarchy from the root of the share. Additionally, in testing something with FIPS mode, I ended up reverting
my virtual machine to an older snapshot.
After removing the extra permissions that weren't present when I was doing my testing and reverting to the older snapshot, I am not having issues accessing the real equivalent of folder3 directly in Windows Explorer via DFS UNC path or creating a shortcut
with the New Shortcut wizard.
Things have been fundamentally changed and I cannot repeat the behavior on this particular folder. I will see if I can recreate the same situation on another folder.

Error when mapping drive with read only permissions - unc path works fine

Hello,
we have user shares that we map to drive H:. the shares are in the form \\server\user\<loginname>. The shares have full permission and the files and folders have full permission for the user. To be clear, the shared folder is \\server\user. <loginname>
are several folders, one for each user.
We use a vb script to check if a user stores too much data and if yes, we set the permissions for the user to read only and delete (with icacls).
Unfortunately, it this happens, we cannot map the drive anymore on Windows 7 (on Windows XP it works fine). The error is "Permission denied". Interestingly, the user can still open the share with the unc - path.
Is there anything I can do, so that the user still has his drive mapped? Most user are not tech savvy enough to open their share with the unc - path.
Thank You,
Peter

Hi Peter,
Sorry for the delay in reply.
Please disable User Account Control in windows 7 to see if you can see the map drive. In the meantime, I suggest to use GPP instead of logon script to map drive.
GP Preferences Will Reduce Logon Scripts : Mapping Drives
http://blogs.technet.com/b/grouppolicy/archive/2009/02/11/gp-preferences-will-reduce-logon-scripts-mapping-drives.aspx
Please refer to the similar thread below to see if it helps:
Windows 7 Drive mapping via Logon script issue
http://social.technet.microsoft.com/Forums/en-US/6cdfae47-1ca0-46e8-8456-6aac2ee616b2/windows-7-drive-mapping-via-logon-script-issue
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Excel Formula Referring to a UNC Path is Corrupted when Open with Particular Workstation

Hi Experts & Support,
I have a critical problem when trying to refer across Excel workbooks which all are located in different network folders.
There is a cell formula referring to another Excel file using UNC path, for instance, \\myserver\share\folder1\file.xlsm.
It works as long as anyone who is opening the file has no mapped network drive-- access this Excel file directly via UNC path.
However, it turns out that one of the workstation (Windows 2008 Server x64), when trying to access this file--even from UNC path directly-- the link is corrupted. The formula is changed automatically to \\myserver\folder1\file.xlsm (please notice a missing
\share\).
And therefore, when the user on Windows 2008 Server save that Excel file, it causes the original file to be corrupted and every one who access the same file from another computers will all encounter a broken link then.
This Windows 2008 Server has no mapped network drive at all. We have done a lot of researches on the Internet but still couldn't find a solution to this. Is there any way we can investigate further and resolve this issue please?
Thanks in advance.

Hi,
In general,this issue should be caused by a mapped drive.you can refer to the KB below:
http://support.microsoft.com/kb/328440/en-us
However, as you can be sure that there is no mapped drive in this server. could you please provide a litter more information about this server? Did a different version of Excel install in this server? Maybe you can try a repair of the office
program.
And I guess we can avoid this by using Hyperlink function.
Wind Zhang
TechNet Community Support

Using UNC paths with Safari

Hi All
I am probably going to look stupid here but.... How do you use a UNC path in Safari?
When I type in \\myserver\ looking for a local server Safari converts it to http://myserver/ which obviously gives me a totally different result. Just used to doing this in i.e. and use it alot in my daily job.
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You should file enhancement request regarding this issue to https://bugreport.apple.com. However I doubt Apple developers implement it since other tested browsers like Firefox and Opera don't support this paths either.

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.... stuff deleted....
Is RMI client support in iPlanet 6.0 truly this buggy or am I missing
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Jack Profit
[email protected]

Make sure to review the Converter sample and employ all of the workarounds
listed there.
David
Jack Profit wrote:
I've got a simple stateless session EJB deployed and I'm trying to connect
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Intermittent loss of UNC path access on Windows Server 2012

Hi All,
I hope someone can help with a major headache we've been having on two Windows Server 2012 boxes since September this year. Basically, these servers will intermittently lose the ability to browse network shares from windows explorer and the only way we have
found to resolve this is to reboot. When the issue happens, we can't even log into the server as it sits at 'applying user settings' - presumably as it is failing to access the netlogon share on our DCs. If we have an active RDP session when the issue occurs,
we can connect. In this instance we see that if you enter a UNC path in Windows explorer and hit enter, nothing happens - no error messages or anything. The only way I can get any response is when trying to access the IPC$ share on another server, which gives
the following response:
\\server\ipc$ is not accessible. You might not have permission to use this resource, Contact the administrator of this server to find out if you have access permissions.
The parameter is incorrect.
Everything looks right from a physical network perspective, as we can ping from the affected servers and DNS queries are working fine. I can even run net view from powershell and see the local servers and shares on these, however any attempt to access shares
just hangs the powershell session.
If I look in the SMBClient event logs, I can see entries like the following:
Event ID 30805
The client lost its session to the server.
Error: The transport connection is now disconnected.
This is made worse by the fact that when this issue happens, we can't even cleanly reboot the server (it just hangs) and have to perform a cold boot.
The firewall has been turned off and we have taken off our antivirus software to eliminate it as a possible cause. We have even rebuilt one of these servers on a clean install of 2012 R2, but the issue re-appeared. We have also tried using different NIC
drivers (Broadcom NICs installed) to no avail. We have also tried disabling IPv6.
We have logged a ticket with Microsoft support, who have come back telling us that this could be related to a known bug with DFS in 2012 for which a fix is being tested prior to release in a few weeks. However, I can't sit around on my hands until then on
the off chance that this fix will resolve our problem. These servers are hosting our production Lync 2013 front end service and when this issue occurs it breaks the address book search and response group services, so this issue is of critical importance for
us to get resolved asap.
Any help on this would be greatly appreciated.

Hi,
That's right, if you hit enter absolutely nothing happens, no error messages. It makes no difference if I try name or IP address - even trying \\localhost doesn't work. A few minutes later after trying, an entry appears in the SMBClient event logs as mentioned
in my original post. To me it looks like something deep within the networking operations of the OS is randomly breaking. Also, if I try to browse the network from Windows explorer, it just hangs. When I try to restart the workstation service, it just gets
permanently stuck in a stopping state and the server has to be cold booted. Once it boots up, everything is working fine again....until the next time. There is absolutely nothing appearing in the application or system event logs indicating the root cause.
I've checked and DNS resolution is working OK and I can telnet to other hosts on all the required ports.
I had originally thought it might be related to the Broadcom NICs as we've had issues with them in the past, but we switched over to use the 2012 inbox driver for them and the same issue happens. I should also mention that one server is a blade and the other
a rackmount box. Dell support have run full diagnostics on both and have come up clean, so it doesn't appear to be a hardware issue. The even more baffling thing is that we have a third server with identical spec and config that does not have the problem.
The only difference with this third server is that it is not part of a Lync pool pairing using DFS and sits in a remote location on a different LAN.
I had thought of trying to drop back to use SMB1 by disabling SMB2 and 3, but I'm not sure if this would adversely affect any other services.
This one really has me stumped.

Open a file in UNC path from jsp page

Hi,
it might be simple but I don't know how i can achieve this,
I have a UNC path to a remote computer something like this,
\\ComputerName\SharedFolder\ResourceFileName
i can open this file from windows by typing the above in Windowes explorer or something like this in browser file://ComputerName/SharedFolder/myfile.txt
I want a simple jsp page that will have a hyperlink or a button which when clicked should prompt me with a dialog to open/save/cancel the file. it should not open the text fine inside the browser itself. when i click open it should open the file in appropriate viewer(i think this is judged by the mimetypes set on my machine).
Thanks in Advance.

khana6454 wrote:
I want a simple jsp page that will have a hyperlink or a button which when clicked should prompt me with a dialog to open/save/cancel the file. it should not open the text fine inside the browser itself. when i click open it should open the file in appropriate viewer(i think this is judged by the mimetypes set on my machine).You need to set the content disposition to 'attachment' rather than 'inline' (which is default).
You may find this FileServlet example useful: [http://balusc.blogspot.com/2007/07/fileservlet.html].
That said, the file needs to be located on the server machine, not on the client machine. If you want to open files from the client machine, rather write a client side application which you can integrate in your webpage, e.g. a signed applet or web start application (jnlp).

RMI Client UnmarshalException with UNC paths

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