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Windows Server Can't Connect through Network but Client Can Connect to Server

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Edited now that I understand more the
issue:



My Windows 2008R2 server is having a
strange networking problem. I can access the server via RDP, File Sharing, etc.




But from the server, I can't connect
to anything on the network - I can't connect to the email server, web servers,
nothing!



I could not find anything in the event
log that is related.



As I have 200+ users using
the file share from it, I don't want to restart it until way late at night when nobody
is using it.



So I'm wondering if anybody knows
what I should look for, anything I can do, etc, to remedy this without
restarting.



Also, what could be the cause - I
obviously don't know that restarting it will resolve
anything.




Earlier post for
info



A Windows 2008R2 server is having issues
accessing domain resources. For example when logged on to this server, if I
try:



\server1\ I get Error code 0x80004005 -
Unspecified Error



gpupdate fails with "The
processing of Group Policy failed. Windows could not resolve the user name. This could
be caused by one of more of the following:
a) Name Resolution failure on the
current domain controller.
b) Active Directory Replication
Latency..."




Name resolution works
using nslookup but seem to fail when going through a Windows
application.



For example, telnet into my email
server fails from this server but works from other computers.



It's not a problem with the network access list
blocking access. Even accessing resources on the same VLAN does not
work.



It's not only name resolution because
accessing the servers by IP Address also does not
work.



And it's not a general connectivity issue
either since I'm accessing the server via RDP and I can use remote administration
tools.




I can even access the windows
shares on this server from my computer.



But from
this computer, I can't access other servers. It also fails in querying Active Directory
to validate some authentication
requests.



EDIT:
An interesting thing
is that if I do:



telnet emailserver 25

I get connect failed.




And
I also get the same if I do
telnet 10.5.2.1
25



But I can ping it. It's not an issue with the
email server as I can telnet into it from another server in the same
subnet.



It's not a general broad networking
issue either since the windows shares on this server are being accessed by many users
right now and I'm currently accessing it via RDP as stated
earlier.



Accessing a samba share of a Linux
server by IP Address also does not work. Seems like this may not be related to the
domain controller.




Accessing the
servier's own shares does not work either when done from the server
itself.



Answer




Restarting the server handled the issue
without doing anything else. Does not tell me what happened however. If anybody has an
idea of what could have created this situation, let me know. Otherwise, rebooting is the
solution to this until someone finds a better one.



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