Solved

Unable to connect to Server via RPC or DCOM

Posted on 2015-02-11
4
140 Views
Last Modified: 2015-05-02
We have applications that connect through DCOM and RPC to a main server, but this server is no longer allowing connections on port 135. I have performed a port test from several other machines in the same domain, but it is not accepting requests from anywhere. I have also attempted to Telnet using port 135 but this doesn't work either.

In addition to the above I have performed a netstat -a on the affected server and it states that there is a connection over port 135 to one of the domain controllers, but when I perform a port query to the affected server from the domain controller it comes back as not listening.

Finally I have performed a Wireshark capture on the server and when a SYN packet comes through the affected server responds with a RST ACK which also suggests that the port isn't listening.

Could anyone shed any light on how I might resolve this issue? I know that a reboot will fix the problem in the short term but in a week or so the problem will reappear, so I am looking for something a little more permanent.

Thanks in Advance
0
Comment
Question by:Martyn Lawson
  • 2
4 Comments
 
LVL 29

Expert Comment

by:Rich Weissler
ID: 40604486
Don't know that I have a solution... but if I were looking at this, the next thing I'd look at would be 'netstat -ab' ... and see if I can find what might be misbehaving.  

And if it comes back reporting 'svchost.exe', might switch to 'netstat -ao'  (and I habitually use 'netstat -aon' so I don't have to wait for name resolution anyway), to get the PID, then ask 'tasklist /svc' which services are using that svchost process.
---
And attacking the problem from another direction, I might comb thru the Event Viewer, probably concentrated in the SYSTEM Event Log for errors, especially around the time the problem started.  I'm hoping there will be a DCOM error in there, which will probably give you the GUID of the component which is hanging.
0
 
LVL 19

Expert Comment

by:compdigit44
ID: 40606918
Where there any y change on the server recently?
Made sure the CPU & memory is not max'd at 100%
The server is not experience ephemeral port exhaustion
0
 

Accepted Solution

by:
Martyn Lawson earned 0 total points
ID: 40746330
In order to resolve this problem I implement hotfix KB2577795
0
 

Author Closing Comment

by:Martyn Lawson
ID: 40755961
The other comments didn't not resolve the problem and I was forced to reboot the server every five days to avoid applications failure
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Configuring network clients can be a chore, especially if there are a large number of them or a lot of itinerant users.  DHCP dynamically manages this process, much to the relief of users and administrators alike!
A safe way to clean winsxs folder from your windows server 2008 R2 editions
This tutorial will walk an individual through the steps necessary to enable the VMware\Hyper-V licensed feature of Backup Exec 2012. In addition, how to add a VMware server and configure a backup job. The first step is to acquire the necessary licen…
This tutorial will walk an individual through configuring a drive on a Windows Server 2008 to perform shadow copies in order to quickly recover deleted files and folders. Click on Start and then select Computer to view the available drives on the se…

911 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

23 Experts available now in Live!

Get 1:1 Help Now