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Problem ISA server 2004 stops traffic on external NIC, needs reboot !

Discussion in 'Networks' started by guess who, May 5, 2010.

  1. guess who

    guess who Bit Poster

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    Hi everybody,

    I'm hoping that you can help me with problem that my company is
    facing.

    We have ISA server standard 2004 SP3 installed on Windows Server 2003
    Enterprise SP2. That server is virtual and is running on Microsoft
    virtual server 2004.

    ISA server has 3 NIC, one external, one internal and one for DMZ. Now,
    ISA server worked fine for over a year, no problems at all. But, since
    month ago, problems started to happen.

    Every day, traffic on external NIC (sent traffic) stops and nothing
    helps but we need to restart server. This happens every day, few times
    per day and it's driving me crazy !!

    The strange part is that we didn't do anything with ISA server, no
    updates or anything. The configuration is set a year ago and has not
    changed. This problem started to happen by itself. Also, I cannot find
    anything strange in the logs on server.

    Please help me resolve this issue because it's impossible to work and my boss will strangle me. :(
     
    Certifications: MCP, MCSA
    WIP: MCSE
  2. DC Pr0Mo

    DC Pr0Mo Kilobyte Poster

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    Is a strange one, anything in the event logs?, have you tried monitoring the external from isa console?
     
    Certifications: MCDST | BSc Network Computing
    WIP: 70-291 | 70-293 | 70-294 | 70-297
  3. guess who

    guess who Bit Poster

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    No, there's absolutely nothing in event logs. :( I haven't tried monitoring external NIC, I have started monitoring tool now. If anything strange comes up, I'll post here.

    Could it be slow connection link that is causing this problem ? Seems that, when there are many people in company, internet link slows down and than traffic stops. Or it could be just coincidence..
     
    Certifications: MCP, MCSA
    WIP: MCSE
  4. Josiahb

    Josiahb Gigabyte Poster

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    Monitoring the traffic sounds like a good place to start for this one, anything new been introduced elsewhere around the time the problem started?
     
    Certifications: A+, Network+, MCDST, ACA – Mac Integration 10.10
  5. dazza786

    dazza786 Megabyte Poster

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    It's chargeable 8)
     
    Certifications: MCP (271, 272, 270, 290, 291, 621, 681, 685), MCDST, MCTS, MCITP, MCSA, Security+, CCA(XA6.5)
  6. Finkenstein

    Finkenstein Kilobyte Poster

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    Probably a long shot, but have you verified that there is a good amount of space free on the server? We ran into an issue where we had fewer than 8GB free due to log file build up and after clearing it up, we didn't have any more connection issues.

    Just a thought.

    Also, check www.isaserver.org great site for ISA questions.
     
    Certifications: MCP, Network+, CCENT, ITIL v3
    WIP: 640-822
  7. guess who

    guess who Bit Poster

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    There's 45GB free space on server so I doubt that's an issue.

    Thanks for the link, I'll post my problem there also. ;)
     
    Certifications: MCP, MCSA
    WIP: MCSE
  8. guess who

    guess who Bit Poster

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    If you solve this problem, I'll give you 20$.. 8)
     
    Certifications: MCP, MCSA
    WIP: MCSE
  9. guess who

    guess who Bit Poster

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    No, everything is the same as before. Nothing new been introduced. :(
     
    Certifications: MCP, MCSA
    WIP: MCSE
  10. BosonMichael
    Highly Decorated Member Award

    BosonMichael Yottabyte Poster

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    Have you tried systematically removing/replacing/disabling components and services to see if the problem remains or disappears? Meaning, have you replaced the NIC with a known-good one? Have you reinstalled the NIC driver? Have you disabled ISA?
     
    Certifications: CISSP, MCSE+I, MCSE: Security, MCSE: Messaging, MCDST, MCDBA, MCTS, OCP, CCNP, CCDP, CCNA Security, CCNA Voice, CNE, SCSA, Security+, Linux+, Server+, Network+, A+
    WIP: Just about everything!
  11. danielno8

    danielno8 Gigabyte Poster

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    ^ this

    i doubt you'll solve the issue without spending time to find out what is happening (or not happening as the case may be) when the issue is present.
     
    Certifications: CCENT, CCNA
    WIP: CCNP
  12. Phoenix
    Honorary Member

    Phoenix 53656e696f7220 4d6f64

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    has your traffic been steadily increasing? ISA has flood mitigation technology built in, and I know on my home network I had to up the number of half open TCP connections and other flood mitigation settings just so it wouldnt stop connectivity if i had too many torrents running :)

    That said, this should flag up on the dashboard somewhere
     
    Certifications: MCSE, MCITP, VCP
    WIP: > 0

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