> Source: [sk87760](https://support.checkpoint.com/results/sk/sk87760)

# sk87760 - SNX fails during large file transfers

| Property | Value |
|----------|-------|
| Solution ID | sk87760 |
| Date Created | 2012-11-15 |
| Last Modified | 2022-04-05 |
| Technical Level | General |
| Products | Security Gateway |
| Versions | R81.10 (EOS), R81 (EOS) |
| OS | Windows |

## Symptoms

- * File download speed significantly decreases after some time.

* Transfer of a large file fails. The connection might stop at some random point.

* Debug of SSL Network Extender shows in *%Program Files%\\CheckPoint\\SSL Network Extender\\slimsvc.log* file:

  `fwasync_connbuf_realloc: Connection buffer overflow. Cannot allocate 1049236 bytes of memory. Limit is 1048576. fwasync_conn_send: fwasync_connbuf_realloc() failed`
* Debug of SSL Network Extender shows in *%Program Files%\\CheckPoint\\SSL Network Extender\\slimsvc.log* file:

  `[wssl] WinSSL_Decrypt: DecryptMessage returned 80090330 (Unknown code 0x80090330)`

## Cause

Changes in VPN driver cause one or several symptoms to occur simultaneously.

## Solution

This problem was fixed. The fix is included in:

* [Jumbo Hotfix Accumulator for R81.10](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk175186) starting from Take 38
* [Jumbo Hotfix Accumulator for R81](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk170114) starting from Take 60
* [Jumbo Hotfix Accumulator for R80.40](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk165456) starting from Take 150
* [Jumbo Hotfix Accumulator for R80.30](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk153152) starting from Take 247
* [Jumbo Hotfix Accumulator for R80.20](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk137592) starting from Take 208

If you choose not to upgrade, Check Point can supply a **Hotfix** . [Contact Check Point Support](https://www.checkpoint.com/support-services/contact-support/) to get a Hotfix for this issue.  
A Support Engineer will make sure the Hotfix is compatible with your environment before providing the Hotfix.  
For faster resolution and verification, please collect [CPinfo files](http://supportcontent.checkpoint.com/solutions?id=sk92739) from the Security Management Server and Security Gateways involved in the case.

**Hotfix installation instructions:**   
Refer to [sk168597 - How to install a Hotfix](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk168597).

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